The chain of triangles are sharp stones coming out of the water. In that world of mine you have them every here and there.

As for the roads, I am only drawing the main roads, otherwise you would lots of roads and also keep in mind that if I draw some roads that are important enough to appear on the map, they will also require lots of work to keep in good condition. You can't just make a cobblestone road and leave it like that :/. But thanks for your comments Eld!