The Moselle carves a 544-kilometre path from the Vosges Mountains to its confluence with the Rhine at Deutsches Eck, where Koblenz has stood sentinel since Roman legions established Confluentes in 9 BCE. The river's sinuous meanders create microclimates that nurture Riesling vines on slate-rich slopes, some pitched at gradients exceeding 60 degrees. These terraced vineyards have defined the valley's economy and topography for two millennia, their stone walls holding soil in place through flood cycles and frost. Departures from Konrad-Adenauer-Ufer navigate the transition zone where the Moselle's gentler current meets the Rhine's commercial flow. The shoreline downstream alternates between medieval Winningen, whose half-timbered Fachwerk dates to the 1400s, and industrial vestiges from the 19th-century coal trade. Paddle-wheel vessels and modern panoramic cruisers operate year-round routes, their schedules synchronized with lock operations at the Koblenz-Moselle canal junction. Spring sailings coincide with vine flowering; autumn departures pass through harvest weeks when mechanical pickers work the steepest parcels. The river's navigability hinges on ten locks between Koblenz and Trier, each raising or lowering vessels up to 12 metres. Lock transits add structured pauses to every upstream journey, intervals when passengers witness the hydraulic engineering that tamed seasonal flooding after the 1920s. Downstream routes move faster, gravity-assisted, passing beneath railway viaducts and road bridges that carry Bundesstraße 416 traffic above the water. Koblenz serves as the valley's northern terminus, where river commerce pivots from viticulture to logistics. The waterfront promenade stretches three kilometres along the Moselle's final reach, its plane trees planted in 1897 to shade customs officials who once inspected wine barrels bound for Rhineland markets. Today the quays handle passenger traffic, not cargo, their bollards repurposed for mooring lines of tour vessels that depart hourly during peak months.