Isleta de San Juan
The Isleta de San Juan is a 3-square-mile (7.8 km2) island off the coast of Puerto Rico, connected to the mainland by bridges and a causeway. It is the site of Old San Juan, the historic quadrant of the territory's capital, San Juan. Its eastern part constitutes the neighborhood of Puerta de Tierra, location of many of Puerto Rico's government buildings. Coordinates: 18°28′0.43″N 66°6′26.47″W / 18.4667861°N 66.1073528°W
...
Wikipedia