Cayo Santiago

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Cayo Santiago
Cayo Santiago.png
Census Bureau map
Cayo Santiago is located in Puerto Rico
Cayo Santiago
Cayo Santiago (Puerto Rico)
Location Humacao, Puerto Rico
Coordinates 18°9′23″N 65°44′3″W / 18.15639°N 65.73417°W / 18.15639; -65.73417
Area 0.139179 km2 (0.053737 sq mi)
Length 0.6 km (0.37 mi)
Width 0.4 km (0.25 mi)
Highest elevation 34.9 m (114.5 ft)
Highest point El Morrillo
United States
Commonwealth  Puerto Rico
Municipality Humacao
Population 0
Density 0 /km2 (0 /sq mi)
Nautical Chart of Cayo Santiago area

Cayo Santiago, also known as Isla de los monos (or Monkey Island), is an uninhabited island, located at 18°09′23″N 65°44′03″W / 18.15639°N 65.73417°W / 18.15639; -65.73417, 950 m (0.59 mi) southeast of Punta Santiago, Humacao, Puerto Rico.


The island measures 600 metres (660 yd) north–south and 400 metres (440 yd) east–west, including the flat northeastern peninsula, which is connected to the main part only by a narrow sandy isthmus. Six hundred meters west of the southernmost point is a shoal, Bajo Evelyn, which has a shallow depth of 8 fathoms. While the island is flat in the north, it reaches a height of 34.9 m (114.5 ft), 2.9 km (1.8 mi) southwest of the island's port, on a small rocky hill called El Morrillo, which rises abruptly from the water and the lowland around it. The area of the island is 0.14 km² (139,179 m2 (1,498,110 sq ft): Block 2000, Census Block Group 2, Census tract 1801, Humacao Municipio, Puerto Rico), of which the northeastern peninsula accounts for about 0.02 km2 (0.01 sq mi). The island is part of Punta Santiago barrio of Humacao.


Warning sign with resident monkey

The island has a free-ranging population of over 1000 Rhesus monkeys. The monkeys are the offspring of an original group of 409 monkeys imported from India in 1938 that were used for scientific research. Today, the island serves as a research center for the University of Puerto Rico Caribbean Primate Research Center, the National Institutes of Health, Yale University, The University of Chicago, and Harvard University. The station accommodates 11 researchers and technicians who take the short boat trip from Humacao on a daily basis and normally don't stay on the island.

Cayo Batata, the second island belonging to Humacao, is located 5.7 km (4 mi) to the southwest.

External links[edit]