Arroyo,
A seaport in the district of Guayama, in the southeastern part of the island of Porto Rico. It is on a bay of the same name, and has a population of about 1,200. Its trade with the United States prior to the war with Spain was annually from 7,000 to 10,000 hogsheads of sugar, 2,000 to 5,000 casks of molasses, and 50 to 150 casks and barrels of bay-rum.