Krakatau & Sangiang Island · Indonesia · Reef
Karang Serang
Bird-whitened rocks off Anak Krakatau mark the dive
Karang Serang is a dive off Anak Krakatau, marked above the water by rocks painted white by seabirds. It is the alternative to Batu Mandi for the second dive of a Krakatau day, and the two share a depth range of 18 to 24 m (60 to 80 ft).
0Where it is and how deep
6.1029° S, 105.4222° EApproximate position — the dashed circle shows where the site lies; your operator's briefing has the mooring.
The dive
The boat finds Karang Serang by its rocks, which the seabirds have painted white, off Anak Krakatau. Underwater lie large blocks of volcanic rock that look sheared off by the blast, their cracked, sharp edges forming a west-facing submarine cliff, with coral just starting to grow in the crevices. East of the rocks, orange gorgonian sea fans grow in astonishing numbers, and reef blacktip sharks patrol the area. The dive runs between 18 m (60 ft) and 24 m (80 ft), the same band as neighbouring Batu Mandi, and it is made after the first dive beside Rakata.
Marine life and season
- Reef sharks
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair | Fair | Good | Good | Good | Good | Good | Good | Good | Good | Good | Fair |
Season follows Krakatau & Sangiang Island: No single month stands out; the very windy west monsoon from December to February is the time to avoid, and wind sets the visibility.
Know before you go
- Anak Krakatau, right beside the site, is an active volcano; its latest eruption began on 4 September 2026.
Sources
- Krakatau Dive Tour — Krakatau Tour
- Krakatau Dive Tour — Krakatau Trek
- Anak Krakatau — OpenStreetMap
- Krakatoa — Wikipedia
More dive sites in Krakatau & Sangiang Island
Reef
Deeper second dive beside the active cone of Anak Krakatau
Reef
Opening dive of the Krakatau day, beside Rakata island
Gentle eastward drift with plenty of green turtles
Similar dives elsewhere
An extended family of blacktip reef sharks on the slope off Metita Island.
Reef sharks and giant trevallies patrolling a coral seamount
Rock cover that puts you close to passing mantas
Several whitetip reef sharks on one terrace at 20 m