Limón (lēmōnˈ) [key], city (1995 est. pop. 55,866), capital of Limón prov., Costa Rica, on the Caribbean Sea. Once the leading port of Costa Rica, it has been superseded by Moín. Limón gained importance with the construction of the railroad to San José in the late 1800s and has been the point of export for Costa Rica's large banana industry. Columbus may have visited the site on his 1502 voyage.