Situated on the ne periphery of the Caribbean Sea, about 1,000 mi (1,600 km) se of Miami, Puerto Rico is the easternmost and smallest island of the Greater Antilles group. Its total area is 3,515 sq mi (9,104 sq km), including 3,459 sq mi (8,959 sq km) of land and 56 sq mi (145 sq km) of inland water.
Shaped roughly like a rectangle, the main island measures 111 mi (179 km) e-w and 36 (58 km) n-s. Offshore and to the e are two major islands, Vieques and Culebra.
Puerto Rico is bounded by the Atlantic Ocean to the n, the Virgin Passage and Vieques Sound to the e, the Caribbean Sea to the s, and the Mona Passage to the w. Puerto Rico's total boundary length is 378 mi (608 km).