The peak falls under the jurisdiction of the towns of Binangonan and Cardona, which divide the island almost into two halves, the west (Binangonan) and east (Cardona). In the middle of the long Talim Island island is a volcanic ridge with Mount Tagapo, its highest peak. The island forms the southwestern rim of the Laguna Caldera, a large caldera that occupies the middle section of Laguna de Bay. Mount Sembrano range, across the lake on the Jalajala Peninsula, forms the eastern and the highest peak of the caldera.