Araruama (Portuguese pronunciation: [ɐɾɐɾuˈɐmɐ]) is a municipality in the state of Rio de Janeiro, Brazil. Located at 22°52'22" of latitude South and 42°20'35" of longitude west, at an altitude of fifty feet. In 2020, its population was 134,293 inhabitants, which places it the second largest population in the Região dos Lagos.
The municipality of Araruama extends over an area of 635.4 km ², marked by plain if some lakes, including the Araruama Lagoon and the Pond Juturnaíba, situated between the municipalities Araruama and Silva Jardim. Geographically it is the largest town in the Região dos Lagos.
Its main geographic feature is a large bay by the same name. Araruama has a large area of Atlantic Forest in between the sea shore and the Araruama Lagoon that belongs to the Costa do Sol State Park.