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Explore Western Gulf Islands

Diving in the Western Gulf Islands of Thailand offers an exceptional experience for enthusiasts eager to explore vibrant marine ecosystems and diverse underwater landscapes. From the bustling reefs of Koh Tao to the sweeping underwater vistas of Koh Phangan, each island presents a unique diving opportunity. Koh Tao, with its dramatic rock pinnacles and colorful reefs, is teeming with marine life, including the occasional visit from whale sharks. These gentle giants often grace divers with their presence, particularly between March and April. The island's reefs are a kaleidoscope of life, ensuring every dive is a feast for the eyes.

Koh Phangan, another gem of the Chumphon Archipelago, is renowned for its stunning dive site, Sail Rock. This submerged pinnacle is a playground for divers, where encounters with batfish, macro critters, and even bull sharks are not uncommon. The clear, warm waters, typically between 28 and 30°C/82-86°F, provide excellent visibility of around 20 meters/65 feet, making it ideal for capturing stunning underwater photography. Whether you choose a shore dive or a boat excursion, the Western Gulf Islands promise an unforgettable diving adventure amidst Thailand’s enchanting seascapes.

Top Regions to Explore

Upcoming Events

Open Water Course

Open Water Course

The Open Water course is the first level of scuba diving certification. Upon completing the course, you will earn an internationally recognized certification that allows you to dive independently with a buddy to a depth of 18 meters.☛ 3-Day Course Schedule: ⌚ DAY 18:30 a.m. -> Paperwork and Equipment09:30 -> Academic12:00 -> 2 Dives5:00 p.m. -> End of the day ⌚ DAY 209:00 -> Academic10:00 -> Final exam12:00 -> 2 Dives5:00 p.m. -> End of the day ⌚ DAY 306:30 -> 2 Dives12:00 -> Certification☛ Price: 9,000 THB⚠️ NOTE: After the first day of in-water training, you can decide whether or not you want to continue with the course. If you decide to stop, you’ll only pay the cancellation fee: 2,500 THB if you cancel after the first dive, or 3,000 THB if you cancel after the second dive. ☛ The course includes:☑️ Diving insurance☑️ 6 dives☑️ Diving equipment☑️ Online study materials☑️ Private departure from our own beach (no transfers or crowded docks).☑️ Our commitment to not take you to overcrowded dive sites, where you’ll see more divers than fish. ✨ MAX 3 Students / Instructor ✨This means we can truly focus on you—something we take very seriously to avoid overcrowded, low-quality courses.We include 6 open-water dives ❗ More time in the water means better training and a much more complete experience.➡ The lowest instructor-to-student ratio on Koh Tao

Ihasia Diving Kohtao, 50/15 moo 3, 84360, Koh Tao, THA
August 11, 2026 +15 More
$272.59
THB 9,000.00
TRY DIVE

TRY DIVE

The Introductory Dive is a one-day activity designed for those who want to experience the underwater world for the first time. No prior experience is necessary. It’s the perfect way to try scuba diving without committing to a full courseThis is not a certification course. If you want to become a certified diver, you must take the Open Water course (2–3 days). ☛ ACTIVITY SCHEDULE: ⌚ 10:30 AM - THEORYA short theoretical session where we’ll show you the diving equipment and explain what the activity will entail once we’re out in the water.⌚ 12:00 PM - TIME TO GO DIVING.Dive 1: An introductory session, starting at a shallow depth and performing some exercises to build comfort and confidence, followed by the dive, which lasts about 45 minutes on average (depending on air consumption).Dive 2: After enjoying some pineapple, cookies, and coffee, it’s time for a second dive.⌚ 5:00 p.m. – RETURN TO THE DIVE CENTER. ☛ PRICES:3,000 THB - 2 DIVES ⭐2,300 THB - 1 DIVE ☛ THE ACTIVITY INCLUDES:✔Diving medical insurance✔ Complete diving gear✔ Beverages and snacks on board (pineapple, cookies, coffee/tea)✔ Private departure from our own beach (no transfers or crowded docks). ⭐ WHAT MAKES OUR INTRODUCTORY DIVE UNIQUE:The key to making your first time underwater 100% safe and relaxed is keeping the group small, so we can keep an eye on you every second, ensuring a much more intimate and personalized experience.✨ We are the school with the lowest instructor-to-student ratio on Koh Tao ✨

Ihasia Diving Kohtao, 50/15 moo 3, 84360, Koh Tao, THA
August 11, 2026 +15 More
$90.86
THB 3,000.00

Dive Activity

Diving in Western Gulf Islands

The Western Gulf Islands offer a plethora of enticing dive sites, drawing enthusiasts with their mix of wreck and shore diving opportunities. Popular wreck dives include the HMCS Cape Breton, a former naval vessel now teeming with marine life, providing an immersive experience for divers. This site, along with others like the HMCS Saskatchewan, offers intriguing exploration opportunities beneath the waves. Shore dives in the region are equally captivating, with locations such as Henderson Point providing easy access to vibrant underwater ecosystems. Divers can often witness unique marine life behaviors, particularly during night dives when the underwater world transforms. The area caters to both shore diving and liveaboard options, striking a perfect balance for divers seeking varied experiences. Enthusiasts can enjoy the convenience of shore dives while still having the opportunity to explore more remote sites via liveaboard trips.

Dive Centers

Dive Sites

The best Months to dive in Western Gulf Islands

The Western Gulf Islands offer diverse diving conditions throughout the year, making them a popular destination for divers. Seasonal water temperatures vary from 8°C–15°C/46°F–59°F, with summer months generally providing warmer conditions. Visibility is typically moderate, ranging from 10 to 20 meters/33 to 66 feet, though it can be affected by plankton blooms in spring, reducing clarity temporarily.

Weather conditions, including wind and ocean currents, play a significant role in diving conditions. The period from late autumn to early spring can bring stronger winds and currents, making some dive sites less accessible. However, diving is possible year-round, with late summer and early autumn being the most favorable periods due to calmer seas and clearer waters. Divers should plan accordingly and be prepared for variable conditions.

Top Wildlife Sightings in Western Gulf Islands

The Western Gulf Islands are a biodiverse hotspot, hosting a variety of marine life that attracts divers year-round. Common reef fish in this area include vibrant parrotfish, damselfish, and butterflyfish, which are frequently seen darting around the colorful coral formations. These species are abundant and can be seen on almost any dive, providing a lively backdrop for underwater exploration.

Seasonal highlights include encounters with larger marine species such as sharks, turtles, and rays. During the warmer months, divers may spot nurse sharks and eagle rays gliding gracefully through the water. Meanwhile, sea turtles, including the endangered green turtle, are more commonly seen during nesting season along the seagrass beds. The likelihood of encountering these majestic creatures increases near protected areas and during specific times of the year when migratory patterns align.

Wildlife Sightings are Based on User Generated Content

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 27

Barracuda

Barracuda

31k Sightings
J
2.6k
F
2.8k
M
3.5k
A
3.2k
M
2.2k
J
2.1k
J
3.7k
A
3.2k
S
2.1k
O
2k
N
1.2k
D
2k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 200

Moray Eel

Moray Eel

17k Sightings
J
1.5k
F
1.5k
M
1.9k
A
1.5k
M
1.2k
J
1.1k
J
2.1k
A
1.9k
S
1.1k
O
1.1k
N
719
D
1k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 600

Wrasse

Wrasse

14k Sightings
J
1.4k
F
1.3k
M
1.6k
A
1.4k
M
975
J
1.1k
J
1.5k
A
1.2k
S
961
O
903
N
864
D
1.1k
Whale Shark

Whale Shark

7.4k Sightings
J
660
F
721
M
647
A
438
M
609
J
397
J
739
A
902
S
1k
O
456
N
250
D
548
Green Turtle

Green Turtle

6.2k Sightings
J
543
F
577
M
544
A
521
M
415
J
437
J
784
A
691
S
455
O
393
N
269
D
547
Hawksbill Turtle

Hawksbill Turtle

2.6k Sightings
J
221
F
335
M
227
A
196
M
118
J
162
J
370
A
333
S
186
O
108
N
125
D
232

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 130

Butterfly Fish

Butterfly Fish

62k Sightings
J
5k
F
5.3k
M
6.2k
A
6.1k
M
4.3k
J
4.5k
J
7.6k
A
6.8k
S
4.6k
O
4.1k
N
3.3k
D
4.5k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 90

Angelfish

Angelfish

54k Sightings
J
4.2k
F
4.3k
M
5.3k
A
5.1k
M
3.8k
J
3.9k
J
7k
A
6.2k
S
4.2k
O
3.6k
N
2.6k
D
3.4k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 250

Grouper/Basslets

Grouper/Basslets

52k Sightings
J
3.9k
F
4.2k
M
5.2k
A
4.9k
M
3.6k
J
3.8k
J
6.9k
A
5.8k
S
4.1k
O
3.5k
N
2.5k
D
3.2k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 100

Parrotfish

Parrotfish

49k Sightings
J
4.2k
F
4.3k
M
5.1k
A
4.8k
M
3.4k
J
3.6k
J
5.6k
A
4.9k
S
3.4k
O
3.3k
N
2.7k
D
3.8k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 8

Bannerfish

Bannerfish

48k Sightings
J
4.1k
F
4.3k
M
5k
A
4.8k
M
3.5k
J
3.6k
J
5.3k
A
4.7k
S
3.3k
O
3.2k
N
2.6k
D
3.7k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 40

Triggerfish

Triggerfish

40k Sightings
J
3.1k
F
3.6k
M
4.6k
A
4.3k
M
2.8k
J
2.8k
J
4.6k
A
4k
S
2.8k
O
2.6k
N
2k
D
2.6k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 28

Clownfish

Clownfish

35k Sightings
J
2.8k
F
3k
M
3.8k
A
3.2k
M
2.4k
J
2.5k
J
4.4k
A
3.9k
S
2.6k
O
2.5k
N
1.9k
D
2.4k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 80

Stingrays

Stingrays

32k Sightings
J
2.4k
F
3k
M
3.3k
A
3.4k
M
2.4k
J
2.2k
J
4.1k
A
3.5k
S
2.2k
O
2.1k
N
1.5k
D
2k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 350

Damselfish

Damselfish

20k Sightings
J
1.6k
F
1.7k
M
1.9k
A
1.9k
M
1.2k
J
1.5k
J
2.3k
A
2.1k
S
1.6k
O
1.7k
N
1.2k
D
1.4k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 130

Pufferfish

Pufferfish

18k Sightings
J
1.6k
F
1.8k
M
2.3k
A
2k
M
1.3k
J
1.2k
J
2k
A
1.6k
S
1.1k
O
1.2k
N
921
D
1.3k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 150

Sweetlips and Grunts

Sweetlips and Grunts

15k Sightings
J
1.2k
F
1.1k
M
1.5k
A
1.5k
M
1.1k
J
1.2k
J
1.8k
A
1.7k
S
1.2k
O
1.1k
N
762
D
1.1k

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 60

Soldierfish

Soldierfish

15k Sightings
J
1.1k
F
1.2k
M
1.5k
A
1.3k
M
928
J
962
J
1.8k
A
1.5k
S
1.2k
O
1.3k
N
771
D
989

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 110

Snapper

Snapper

13k Sightings
J
1k
F
1.1k
M
1.5k
A
1.5k
M
962
J
999
J
1.6k
A
1.3k
S
886
O
905
N
566
D
866

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 90

Goatfish

Goatfish

12k Sightings
J
802
F
873
M
1.2k
A
1.3k
M
761
J
894
J
1.6k
A
1.3k
S
862
O
907
N
513
D
718

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 60

Squirrelfish

Squirrelfish

12k Sightings
J
814
F
932
M
1.2k
A
1.1k
M
733
J
756
J
1.5k
A
1.2k
S
913
O
1k
N
643
D
802

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 3000

Nudibranch

Nudibranch

11k Sightings
J
839
F
876
M
1.2k
A
1.1k
M
839
J
847
J
1.4k
A
1.2k
S
929
O
758
N
407
D
695

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 80

Emperor

Emperor

11k Sightings
J
864
F
883
M
1.1k
A
970
M
637
J
701
J
1.3k
A
1.2k
S
736
O
885
N
653
D
887

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 40

Jackfish

Jackfish

10k Sightings
J
894
F
853
M
989
A
1k
M
755
J
891
J
1.3k
A
1.1k
S
674
O
629
N
333
D
713

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 85

Surgeonfish

Surgeonfish

8.4k Sightings
J
667
F
744
M
991
A
853
M
606
J
568
J
998
A
892
S
612
O
589
N
339
D
538

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 25

Boxfish

Boxfish

5.8k Sightings
J
300
F
312
M
373
A
294
M
286
J
507
J
1k
A
1.1k
S
706
O
534
N
196
D
242

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 3400

Shrimp

Shrimp

5.2k Sightings
J
331
F
288
M
430
A
491
M
375
J
452
J
782
A
681
S
489
O
400
N
237
D
222

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 20

Porcupinefish

Porcupinefish

4.9k Sightings
J
395
F
465
M
771
A
586
M
316
J
279
J
499
A
359
S
258
O
355
N
234
D
335

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 15

Tuna

Tuna

4.8k Sightings
J
262
F
248
M
504
A
404
M
328
J
315
J
623
A
577
S
383
O
593
N
324
D
246

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 15

Garfish

Garfish

3.4k Sightings
J
271
F
321
M
405
A
273
M
177
J
190
J
435
A
463
S
277
O
288
N
151
D
137

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 7000

Crab

Crab

3.2k Sightings
J
192
F
269
M
263
A
349
M
241
J
268
J
447
A
391
S
261
O
197
N
190
D
166

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 12

Lionfish

Lionfish

2k Sightings
J
139
F
144
M
229
A
168
M
218
J
212
J
326
A
197
S
111
O
121
N
62
D
49

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