The Alto Mayo Protection Forest is an area of protected forest land in northern Peru. It is located in Rioja and Moyobamba provinces within the region of San Martin, with a small part in Rodriguez de Mendoza province, in the region of Amazonas. This area preserves a portion of the tropical yungas forest in the upper Mayo River basin, while protecting soil and water from erosion by deforestation, as the area is the water supply of populations in the Mayo valley.