The four radar systems used by the Federal Aviation Administration in Puerto Rico were broken and took almost two weeks to restore. One of the radar systems is located at Punta Salinas in Toa Baja. In mid 2018, the United States Army Corps of Engineers announced it would be undertaking a major flood control project of a river that often causes flooding in Toa Baja, Río de la Plata. Toa Baja is located in the Northern Coastal Plains of the island, in the karst zone. It has an area of 24.0 miles2 (62.4 km2). The terrain consists mostly of alluvial deposits and clay-like surface as a result of the surrounding waters. The elevations range from 200 to 490 feet (60 to 150 meters) above sea level, with most of its highest parts located in the south. The rest of the area is mostly plain. The northern part of Toa Baja is characterized for its mangroves and marshes, while the southern part is classified as typical karst area. Updated flood zone maps (as of 2019) show that Toa Baja is extremely vulnerable to flooding, along with Humacao, Rincón, Barceloneta, and Corozal. For its many rivers, almost the entire municipality of Toa Baja is in the flood zone area. Homes in Toa Baja have historically been built a few feet above ground level to account for flooding. After Hurricane Maria, architects from the University of Puerto Rico and Polytechnic University of Puerto Rico provided residents of Toa Baja with ideas on how to mitigate flooding. There are three main rivers in Toa Baja: Río de la Plata, Río Cocal, and Río Hondo. La Plata is the longest river on the island and crosses Toa Baja in the east. Cocal is the natural boundary between Toa Baja and Dorado. Boca Vieja Bay () is a bay located in Toa Baja. Like all municipalities of Puerto Rico, Toa Baja is subdivided into barrios. The municipal buildings, central square and large Catholic church are located in a barrio referred to as . Barrios (which are like minor civil divisions) in turn are further subdivided into smaller local populated place areas/units called sectores ("sectors" in English). The types of "sectores" may vary, from normally "sector" to "urbanización" to "reparto" to "barriada" to "residencial", among others.