More volcanoes in the neighbourhood of Mentolat include Melimoyu and Cay to the north, Maca and Cerro Hudson to the south, as well as several monogenetic volcanoes. South of Hudson, the Chile Rise subducts in the trench. Volcanic activity is absent in the long area, as its subduction disrupts the slab. These volcanoes are part of the Southern Volcanic Zone, while the volcanoes south of this gap belong to the Austral Volcanic Zone. Changes in magma composition are also noticeable across the gap; the volcanoes of the southernmost Southern Volcanic Zone have erupted basalt and basaltic andesite with subordinate andesite, dacite and rhyolite, while the volcanoes of the Austral Volcanic Zone have erupted adakitic hornblende andesites and dacites.