The Cayaguas River () is one of the main tributaries of the Loíza River (Río Grande de Loíza) that flows through the municipality of San Lorenzo in Puerto Rico.Departamento de Recursos Naturales y Ambientales (DRNA), Gobierno de Puerto Rico. Cuenca del Río Grande de Loíza. Retrieved September 9, 2025, from https://www.drna.pr.gov/historico/oficinas/saux/secretaria-auxiliar-de-planificacion-integral/planagua/inventario-recursos-de-agua/cuencas-hidrograficas/Cuenca%20del%20Rio%20Grande%20de%20Loiza.pdf
See also List of rivers of Puerto Rico
References
External links USGS Hydrologic Unit Map – Caribbean Region (1974) Rios de Puerto Rico