Other monuments in the National Park System also preserve the remains of different types of prehistoric ruins. Two of these, Mesa Verde National Park, Colo., and Chaco Canyon National Monument, N. Mex., contain remains of Indian groups which seem to have been related to those at Aztec Ruins National Monument. A third, Bandelier National Monument, N. Mex., contains remains of another type but still may be one of the areas in the Rio Grande drainage in which some of the Indians lived after they abandoned the San Juan region.