In fact... I can expand on that a little.
I can be in a boat and out of sight of land, and not feel the least bit uncomfortable. But being on land, and out of sight of water is *truly* uncomfortable to me. I spent a week in Kansas City once... and the mere thought about how far away from saltwater I was at the time really was oppressive. Nothing but dirt as far as the eye could see... yikers... how do you navigate in that stuff? :-)
I feel that way if I'm away from trees. Austin and the surrounding area are really quite "green", but it still took me a while to get used to it. They were *different* trees from the ones I grew up with...