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outdooroutdoorsoutsideexteriorexteriorsEuropeWestern EuropeSpainCastile and LeonCastile-LeonCastilla-LeonCastilla y LeonSalamanca ProvinceProvince of Salamancabuildingbuildingsbridgebridgesviaductviaductsrailwayrailwaysrailroadrailroadsriverriversborderbordersboundaryboundariesfrontierfrontiers