It is a diamond-shaped canton, with the Río Purgatorio (Purgatory River) and the Río Frío (Cold River) as the northeast border, the Río Cucaracha (Cockroach River) as a portion of the southeast border, the Cordillera de Guanacaste on the southwest border, and the Río Rito and the Río Mónico on the northwest. Tenorio Volcano marks the far western point of the canton.