Carolina is a city and municipality on the northeastern coastal plain of Puerto Rico, immediately east of San Juan and Trujillo Alto, north of Gurabo and Juncos, and west of Canóvanas and Loíza. Part of the San Juan metropolitan area, Carolina encompasses 12 barrios, in addition to the downtown area and administrative center of Carolina Pueblo. In Carolina’s coastal region lies the resort and residential district of Isla Verde, where the main international airport of Puerto Rico, the Luis Muñoz Marín International Airport, is located. Carolina is the third-most populous municipality in the archipelago and island.