mettlach, germany - 07 17 2024: saar river lock sluice, high walls with low water level

bridge waterway walkway canal river water transport reservoir channel wall track reflection dock vehicle pond pier infrastructure boardwalk mettlach germany 2024 saar lock sluice empty small town valley close saarschleife north german area saarland borders luxembourg france idyllic quiet touristic summer bike routes ships passing high walls low level sarre saravus channeled managed calm schleuse staustufe management shipping tourism travel destination trip famous tourist vacation journey saargebiet der