Historic hilltop walled medieval village of Mertola with castle, on the banks of the river Rio Guadiana, Baixo Alentejo, Portugal, Europe

mertola portugal guadiana river castle town city river sailboat sailing boat water reflection sunny clear day blue sky green hills mountains historic ancient architecture travel tourism europe mediterranean landscape scenic view nature outdoors destination vacation holiday culture history landmark building cityscape panorama sightseeing exploration adventure scenery beautiful amazing breathtaking captivating picturesque