Toa Baja, Puerto Rico in the context of "Cataño, Puerto Rico"

Bayamón (Spanish pronunciation: [baʝaˈmon], locally [baʝaˈmoŋ]) is a city and municipality in Puerto Rico. Located on the northeastern coastal plain, it is bounded by Guaynabo to the east, Toa Alta and Naranjito to the west, Toa Baja and Cataño to the north, and Aguas Buenas and Comerío to the south. Part of the San Juan metropolitan area, Bayamón is spread over 11 barrios and the downtown area and administrative center of Bayamón Pueblo. With a population of 185,187 as of the 2020 census, it is the second most populated municipality in the archipelago and island after the capital of San Juan.

San Juan Bay (Spanish: Bahía de San Juan) is a semi-enclosed bay, estuary, and harbor connected to the North Atlantic Ocean in the northeastern coastal plain of the main island of Puerto Rico. Surrounded by the capital municipality of San Juan and adjacent municipalities within its metropolitan area, namely Guaynabo, Cataño, and Toa Baja, the bay is home to Port of San Juan, the primary seaport in the archipelago and island. About 3.5 miles (5.6 km) in length and 0.55 to 2 miles (0.89 to 3.22 km) in width, it is the largest body of water of several interconnected lagoons, channels, rivers, and creeks in the San Juan Bay Estuary, which covers about 83 square miles (215 km) of land and 14 square miles (36 km) of water in the San Juan metropolitan area in northeastern Puerto Rico.

Named after John the Baptist, whose name explorer Christopher Columbus gave to the main island of Puerto Rico as San Juan Bautista (Saint John Baptist) upon its discovery during his second vovage in 1493, San Juan Bay was first discovered and explored by Spanish conquistador Juan Ponce de León, who began the European colonization of the archipelago along its shorelines.

Fortín San Juan de la Cruz (English: Fort Saint John of the Cross), most commonly known as El Cañuelo, was built on Isla de Cabras in the Palo Seco barrio of the municipality of Toa Baja, at the western end of the entrance to San Juan Bay, in Puerto Rico. The square coastal fort has massive sandstone walls that date back to the 1630s. Although the U.S. Navy bombarded the fort in 1898, the fort survived. Today the fort is part of the San Juan National Historic Site, which is listed as a UNESCO World Heritage Site and on both the National Register of Historic Places and the Puerto Rico Register of Historic Sites and Zones. The fort is not open to visitors, but it can be viewed from its exterior.

The La Plata River (Spanish: Río de la Plata) is the longest river in Puerto Rico. It is located in the north coast of the island. It flows from south to north, and drains into the Atlantic Ocean about 11 miles (18 km) west of San Juan. The mouth of the river is a resort area with white sandy beaches.

La Plata has a length of approximately 74 kilometres (46 mi) with its origin in the municipality of Guayama, Puerto Rico, at an altitude of approximately 2,625 feet (800 meters) above sea level. It crosses the municipalities of Guayama, Cayey, Comerío, Naranjito, Toa Alta, Toa Baja, and Dorado forming two reservoirs in its path: Carite Lake and La Plata Lake.

Toa Alta (Spanish pronunciation: [ˈtoa ˈalta]) is a town and municipality of Puerto Rico located in the northern coast of the island, north of Naranjito; south of Dorado and Toa Baja; east of Vega Alta and Corozal; and west of Bayamón. Toa Alta is spread over eight barrios and Toa Alta Pueblo (the downtown area and the administrative center of the city). It is part of the San Juan-Caguas-Guaynabo metropolitan statistical area. There are nine barrios in Toa Alta and altogether in 2020 had a population of 66,852. Río de la Plata, is a large river that runs through Toa Alta. Toa Alta celebrates its patron saint festival in May.