The Samalayuca Dune Fields, more traditionally known as Los Medanos (the dunes), or more recently referenced as Medanos de Samalayuca are a series of large but separated fields of sand dunes located in the northern part of the Mexican state of Chihuahua. The dune fields are scattered over a wide expanse of desert to the south, southwest and southeast of Ciudad Juárez. The dune fields are located in a 2000 km2 area known as the Samalayuca Desert.