Lake Amistad Waterfront and Water Views Lots in Diablo Heights. 63 beautiful Lots / 116.85 total acres. This amazing subdivision is located along the eastern side of Devils River just above Lake Amistad in Val Verde County. Wildlife can be found all through the subdivision including quail, dove, migratory birds, ducks, turkey, sheep and white tail deer. Located 30 miles from Del Rio and 7 miles from boat storage, Hookers Country Store, fuel and boat ramp.