
Sumilon Island
Dumaguete · Philippines
Sumilon Island, just off the southern tip of Cebu across from Dumaguete, was the Philippines' first marine sanctuary and still retains some of the most pristine coral gardens in the Visayas, where schooling sardines form shimmering tornadoes that spiral around divers in the 5 to 20 metre range. The island's eastern wall drops beyond sport diving limits in dramatic stair-steps of hard coral terraces, while the protected western lagoon offers calm, shallow reef for beginners. Seasonal upwellings from the Cebu Strait attract whale sharks and thresher sharks, making Sumilon an unusual combination of spectacular fish-life reef and occasional big-animal encounter.
Conditions
Depth
5 to 40 m
Advanced depths
Current
Can be moderate
Can pick up on the edge
Visibility
10 to 22 m
Clearest in the calm season
Water
25 to 30°C
3mm wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 25 | 25 | 26 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 25 |
| Vis (m) | 15 | 15 | 15 | 15 | 12 | 10 | 10 | 10 | 12 | 12 | 15 | 15 |
| Current | Moderate | Moderate | Gentle | Gentle | Gentle | Moderate | Moderate | Moderate | Gentle | Gentle | Gentle | Moderate |
Your chances of seeing each animal
Blacksaddle Toby
Last confirmed May 4, 2026 · 117 records
Almost always
Nearly every dive
Ornate Ghostpipefish
Last confirmed May 4, 2026 · 79 records
Almost always
Nearly every dive
Dusky Nembrotha
Last confirmed Jun 27, 2026 · 65 records
Almost always
Nearly every dive
Green Sea Turtle
Last confirmed Jun 26, 2026 · 79 records
Almost always
Nearly every dive
Anna'S Chromodoris
Last confirmed Jun 12, 2026 · 56 records
Almost always
Nearly every dive
Thresher Shark
Last confirmed Oct 29, 2025 · 1 records
Sometimes
About 1 in 3 dives
Sardine
Expected
Known here, not yet in recent logs
Bumphead Parrotfish
Expected
Known here, not yet in recent logs
Gear