Caroni County occupies 557 km2 (215 sq mi) in the west central part of the island of Trinidad, the larger island in the Republic of Trinidad and Tobago. It lies south and southwest of Saint George County, west of Nariva County and north of Victoria County. To the west it is bounded by the Gulf of Paria. County Caroni includes the town of Chaguanas, the largest town (by population) in the country.