kaub in rhine valley with steep vineyards

river coast sea bay reservoir vehicle waterway shore lake channel boat boating fjord town harbor beach watercraft mountain burg gutenfels kaub steep vineyards small middle rhine valley mittelrheintal famous castles towns area unesco world heritage site medieval settlements rheintal touristic west germany pfalzgrafenstein island rhein taunus side rhien vine vineyard steep vineyard vineyard hill winemaking agriculture vine culture wine winery plant row plants