Puerto Rico is an archipelago located in the northeastern Caribbean Sea, positioned between the Caribbean Sea and the North Atlantic Ocean. It lies about 50 miles (80 km) east of the Dominican Republic, 40 miles (65 km) west of the U.S. Virgin Islands, and approximately 1,000 miles (1,600 km) southeast of Miami, Florida, in the United States

. It is the smallest and easternmost island of the Greater Antilles, with the Atlantic Ocean to its north and the Caribbean Basin to its south

. The main island is roughly rectangular, measuring about 110 miles (177 km) from east to west and 40 miles (65 km) from north to south

. The archipelago also includes smaller islands such as Vieques, Culebra, and Mona

. Puerto Rico is a self-governing commonwealth and an unincorporated territory of the United States, with its capital at San Juan