Census Bureau map

Cayo Santiago, also known as Monkey Island, is an uninhabited island, located at 18°09′23″N, 65°44′93″W, 950 m southeast of Punta Santiago, Humacao, Puerto Rico. It extends 600 m north-south and 400 m east-west, including the flat northeastern peninsula Cayo de los Algodones which is connected to the main part only by a narrow sandy isthmus. On the west side is a bay, Baja Evelyn. While the island is flat in the north, it reaches a height of 34.9 m 2.9 km southwest of the port, in 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: Block 2000, Census Block Group 2, Census tract 1801, Humacao Municipio, Puerto Rico), of which Cayo de los Algodones accounts for about 0.02 km². The island is part of Punta Santiago barrio of Humacao. metre or meter, see meter (disambiguation) The metre is the basic unit of length in the International System of Units. ... Image:Humacao seal. ... A peninsula in Croatia A peninsula (from the latin words paene insula, almost island) is a geographical landform consisting of an extension of a body of land from a larger body of land, surrounded by water on three sides. ... The Isthmus of Panama connects North and South America. ... The metre, or meter (symbol: m) is the SI base unit of length. ... A census block is the smallest geographic unit used by the United States Census Bureau for tabulation of 100-percent data (data collected from all houses, rather than a sample of houses). ... A census block group is a geographical unit used by the United States Census Bureau which is between the census tract and the census block. ... A census tract, census area, or census district is a particular community defined for the purpose of taking a census. ... Barrio is a Spanish word meaning district. ...

The island has a free ranging population of about 950 Rhesus monkeys. The monkeys are offspring of an original group of 409 monkeys imported from India that were used for scientific research in the 1938. Today the island serves as a research center for the University of Puerto Rico (Caribbean Primate Research Center) and the National Institute of Health. 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. Binomial name Macaca mulatta Zimmermann, 1780 The Rhesus Macaque (Macaca mulatta), often called the Rhesus monkey, is one of the best known species of Old World monkeys. ... The University of Puerto Rico (UPR) is the university system of Puerto Rico. ... The National Institutes of Health is an institution of the United States government which focuses on medical research. ...

Cayo Batata, the second island belonging to Humacao, is located 5.7 km to the southwest. Humacao Estuary, with Cayo Batata in the southwest Cayo Batata is an uninhabited, grass-covered island, located at , 600 m east of Morro de Humacao, the closest mainland feature (which is immediately south of the mouth of Río Humacao), in Humacao, Puerto Rico. ...

External link

• University of Puerto Rico page
• nautical description