mountain bike trail

soil trail asphalt track waterway geology road infrastructure wall tree walkway lane transport ridge grass rock plant woodland mountain bike sign eifel landscape caldera lakes daun called dauner maare three close levels rural west germany hiking trails lead area wild landscpae shape goats donkeys hike path forest dirt gravel narrow walking walk leisure travel bicycle cycling fahrrad rad bicicleta twowheeled steerable machine pedal riding ride driving velo biking