xujiagou reservoir at the foot of qinling mountain

3km2 angle area banks belt both bottom built calm changan city cliff cloudscape colors dam dayu diluvial district drainage fall fan foot fort gully horsetooth kuyu lake landscape layer loam located loess lower mountain mountains north pebble proluvial qinling reflection reservoir river sandstone scenery shangbao site source township upper view village water wide xian xujiagou yangzhuang