Laguna Mariñaqui is a volcano in the Malleco Province of the Chilean Andes.
The volcano consists of two craters located along a fault zone apart with associated pyroclastic material and andesitic lava flows on a high plateau at an elevation of . Cerro Chapulul is an associated cinder cone that was formed during the Holocene.
The stratovolcanoes of Copahue and Tolguaca respectively lie to the north and south-southwest of the Laguna Mariñaqui system.
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