Dried seaweed washed up on the shore
– or more correct abandoned by the tide or the wind.
Many trails to see or to follow.
Trails “drawn” in the rapeseed field by a farmer.
Nature has created a waterway here, not visible from a distance.
Running water is always looking for a trail downhill.
– always the easiest way, never more than necessary.
Underneath Paris there “water trails”, actually forbidden area.