Puerto Rico is the smallest and easternmost island of the Greater Antilles. The coquí frog is Puerto Rico's national mascot and sings at night. El Yunque National Forest is the only tropical rainforest in the US National Forest System, containing over 240 plant and tree species. San Juan is the capital and oldest city, founded in 1521 with a large natural harbor. Salsa music originated from Puerto Rican communities in New York and blends Cuban and African influences. Bomba and plena are distinct musical traditions, with bomba being of pure African origin and plena blending Taíno and other cultural elements.