el malpais national monument with double sinks lava tube near el calderon crater, new mexico

rock geology terrain cliff wall formation badlands fortification landscape mountain waterway malpais national monument bat cave lava tube calderon crater mexico large volcanic trail southwest desert western usa flows barren juniper trees ponderosa pines flat wide open tunnel volcano volcanoes eruptions volcanism beds lavabeds nature natural environment park parks outdoors hike hiking remote wild wilderness north america united states blue sky afternoon light double sinks usa