The Somoto Canyon is a 120-150 meters deep canyon located in the Madriz Department of Nicaragua. Is believed to have formed 5 to 15 million years ago during the Miocene period.

The confluence of the Tapacalí and Comali Rivers at the head of the canyon form the Coco River, which flows through the canyon and onward 750 kilometres to the Caribbean Sea.

The Somoto Canyon was declared a national monument on November 29, 2006. The Somoto Canyon National Monument comprises one of 78 protected areas of Nicaragua and is managed by Ministry of the Environment and Natural Resources (MARENA). The Somoto Canyon National Monument protected area covers an area of approximately 170 hectares (420 acres), of which 125 hectares (310 acres) are in the actual zone of the canyon.