Casima is located at 618 meters above sea level on the right bank of the Breggia river. The village, which probably emerged in the Middle Ages, is first mentioned in 1507 and was dependent on Cabbio until it became an independent municipality in 1805. From a spiritual point of view, the two communities had already separated earlier, when the parish of Casima was founded in 1788 and the church of the Addolorata and San Carlo Borromeo was elevated to the status of a parish church; From 1789 it was rebuilt in the classicist style on an older building (and known since 1619) and inaugurated in 1823. Alpe Traversa, whose remains are now overgrown by vegetation, belongs to the area of the former municipality and from the middle of the 19th century its population shrank drastically: from 149 inhabitants in 1850 to just 34 in 1980.
Casima is also an example of how the inhabitants on the left side of the valley (including those of Monte and Campora) were dependent for administration on those on the right side (Caneggio, Bruzella and Cabbio). They were connected to these villages by an ancient network of paths on the valley floor, for example the one that crosses the river at Punt da Campura; This path was built in the mid-18th century and renovated in 1994 and connects Caneggio with its former district. Since little land was available, the valley communities built closed settlements and planted fields at different elevations on both sides of the Breggia River.