Casita is a classic cinder-cone that rises some 650 meters (2100 feet) above sea level. Although dwarfed by its near neighbors San Cristobal (1745 m / 5600 ft), Telica (1060 m / 3400 ft), and Santa Clara (840 m / 2700 ft), Casita’s form generates slopes exceeding 40% in some areas, especially near the crater rim. Vegetation on these slopes ranges from non-existent near the rim to low grasses and thorny scrub farther down to deforested, scattered trees, or light secondary forest around the base. Casita is considered dormant, with evidence of still-molten magma below the surface (active steam vents), but its last eruption was pre-historic.

A seldom-traveled cobbled road, which crisscrosses the landslide area, leads to the summit.

Castia was last reported active in the 16th century. Eruption in 1550.