ruins of sau reservoir church with rocky landscape, catalonia

catalan history catalonia sau ancient architecture arid change church cliffs climate crisis conservation cracked earth deserted desolation drought dry environmental degradation erosion exploration global warming heritage historical site impact lakebed landscape natural disaster nature outdoor reservoir rocky ruins rural scarcity severe sightseeing spain structure terrain tourism travel water weather exposed stand prominently against backdrop distant dried bed this historic usually submerged now reveals effects prolonged region 39aph39 resources