Canóvanas combines flat alluvial plains in the center and north, areas with both gentle hills and rugged, deeply dissected mountainous areas made up of volcaniclastic rocks (lava flows and exposed intrusive igneous rocks) to the southeast and south. The Cuchilla de Santa Inés, a limestone hill (mogote) with an elevation of 328 feet, rises from coastal sediments on the northeast of the city near San Isidro, while the Cuchilla El Asomante lies at the south with elevations that range from 656 to 2,296 feet.