Casiri is part of the Cordillera del Barroso; generally, the terrain around Casiri is dominated by various volcanic and fluvioglacial formations along with some moraines. The mountain chains Barroso and Huancune lie southwest and south from Casiri, respectively, and the neighbouring mountains Auquitapie and Iñuma are covered with snow. Geologically, Casiri is considered to be part of the so-called Paucarani Volcanics.