rio unhais river and concrete santa luzia dam in vale grande, portugal.

coast cliff terrain sea reservoir bay mountain cape fjord river lake shore waterway vacation hill cove aerial arch dam background barrage barragem santa luzia beautiful blue building cabril coimbra district concrete countryside engineering europe green hydroelectric industrial landscape natural nature pampilhosa serra panorama park portugal portuguese power retention rio unhais rock scenery station stone summer technology travel vale grande vidual view viewpoint water zaordf zere fabulous positioning use visible top