I'm fairly new to to fantasy mapping and CC3, thought I did some sketches on Paper when I was DM RPs... but i thought i get it more 'professional' ...

Anyway I get a hold of ProFantasy's CC3 and watched the tutorial Video, and i tried making a map, and did continent. After that i started to add land masses. when its IN the continent there is no problem... but when at the edge...its problematic. It goes of the continent... I don't want that... I want to create a sand shore, but whenever i create a terrain like that, the lines goes off the continent and into the ocean. I don't want that.

Is there a way to trace the continent lines? Or at least the terrain tool snaps to the continent edges?