
Zamami Whale Watching Dive
Kerama Islands · Japan
The open channel northwest of Zamami Island serves as a primary calving ground for humpback whales migrating from the North Pacific each winter, making it one of the very few places on earth where divers can enter the water alongside these 15-metre giants in good visibility. Mothers and calves rest in the shallows while escorts circle protectively, and on calm days the resonant song of adult males carries through the water column from kilometres away. Outside whale season, the same seamount edges host aggregations of spotted eagle rays and white-tip reef sharks patrolling the current lines.
Conditions
Depth
5 to 30 m
Open water and up
Current
Usually still
Can pick up on the edge
Visibility
15 to 25 m
Clearest in the calm season
Water
19 to 30°C
3mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 19 | 19 | 20 | 22 | 24 | 27 | 28 | 28 | 27 | 25 | 23 | 20 |
| Vis (m) | 20 | 20 | 20 | 20 | 20 | 15 | 15 | 15 | 15 | 20 | 20 | 20 |
| Current | Moderate | Moderate | Moderate | Gentle | Gentle | Gentle | Still | Still | Gentle | Gentle | Moderate | Moderate |
Your chances of seeing each animal
Green Sea Turtle
Last confirmed May 18, 2026 · 28 records
Very likely
Most dives
Blueberry Hermit Crab
Last confirmed May 3, 2026 · 32 records
Very likely
Most dives
Ijima'S Turtle-Headed Sea Snake
Last confirmed Apr 28, 2026 · 17 records
Very likely
Most dives
Tomato Clownfish
Last confirmed Apr 28, 2026 · 19 records
Very likely
Most dives
Clark'S Anemonefish
Last confirmed Apr 19, 2026 · 21 records
Very likely
Most dives
Humpback Whale
Last confirmed Feb 24, 2026 · 17 records
Likely
About 6 in 10 dives
White-tip Reef Shark
Last confirmed Apr 19, 2026 · 3 records
Likely
About 6 in 10 dives
Spotted Eagle Ray
Expected
Known here, not yet in recent logs
Gear