Pretty sure the lines are all of the above.

The waves cause the coast, which is usually a series of shelfs and the coast affects the waves. So they are coast-wave-water-shelf lines. Pretty sure that's not the official name for them, but I know that whatever you call them, everyone knows what you mean

@ Diamond - it looks a lot better now

I don't feel like the mountains are coming to get me

It DOES stilll look like *really* rocky country - makes me want to go on an ADVENTURE!