The Dominican Republic occupies the eastern two-thirds of the island of Hispaniola (Española) and includes the islands of Beata, Catalina, Saona, Alto Velo, and Catalinita in the Caribbean Sea, and several islets in the Atlantic Ocean. It has an area of 48,730 sq km (18,815 sq mi), with a length of 386 km (240 mi) E – W , extending from Cape Engaño to the Haitian border, and a width of 261 km (162 mi) N–S, extending from Cape Isabela to Cape Beata. Comparatively, the area occupied by the Dominican Republic is slightly more than twice the size of the state of New Hampshire. Bounded on the N by the Atlantic Ocean, on the E by the Mona Passage (which separates it from Puerto Rico), on the S by the Caribbean Sea, and on the W by Haiti, the Dominican Republic has a total boundary length of 1,648 km (890 mi), of which only 360 km (194 mi) is the length of the land boundary with Haiti.
The Dominican Republic's capital city, Santo Domingo, is located on its southern coast.