- Shelter
- NW, N, NE, W, E
- Seabed
- sand, algae
- Anchoring
- Allowed
Anchorage off Cayo Santiago, the monkey island 0.5 NM off Punta Santiago at Humacao, east coast of Puerto Rico, home to a rhesus macaque colony since 1938.
Guide
Approach and anchoring
Sand and weed bottom. Sheltered from NW through N to E, open to the south. Naguabo is 2.3 NM to the north-east.
Practical
Anchoring permitted around the island, but landing is forbidden: the cay is a University of Puerto Rico research station and only scientists go ashore. The macaques carry herpes B, which can be fatal to humans.
History
Primatologist Clarence Carpenter released around 450 rhesus macaques from India on the cay in 1938, with the support of Columbia University and the University of Puerto Rico School of Tropical Medicine.
Key facts
- Type
- Anchorage
- Coordinates
- 18.15781, -65.73793 (18°9.47'N 65°44.28'W)
- Country
- Puerto Rico
- Shelter
- Sheltered from north-west, north, north-east, west, east winds
- Seabed
- sand, algae
- Anchoring
- Allowed
- Boaters' rating
- 3.4/5
- Updated
- October 14, 2026
Getting there
Cayo Santiago lies at 18°9.47'N 65°44.28'W, that is 18.15781, -65.73793 in decimal degrees.
Boaters' reviews
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Write a reviewFrequently asked questions
Which winds is Cayo Santiago sheltered from?
Cayo Santiago is sheltered from north-west, north, north-east, west, east winds.
Can you anchor at Cayo Santiago?
Yes, anchoring is allowed at Cayo Santiago.
How do boaters rate Cayo Santiago?
Cayo Santiago is rated 3.4/5 by boaters on BoatMap.
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