The Seas of Titan?
It probably comes as no surprise that I've never been to Titan, the largest moon Saturn, and the only other body in the solar system that is known to have liquid lakes and seas on it's surface. But if I had been there to photograph the shoreline of one of its large seas.... maybe this is what it would look like? Of course the liquid would be ethane, and the rocks would be water ice. But the weed... I bet it really does look like this!