Fortín de San Gerónimo
Fortín de San Gerónimo de Boquerón is a small historic fort located at the mouth of the Condado Lagoon in San Juan Islet across from the district of Condado in the barrio of Santurce in San Juan, Puerto Rico. It was built during the 18th century to replace a smaller battery (called El Boquerón) that stood at the easternmost end of the San Juan islet.