Thanks all!

@Ravells: Those aren't fjords, they're mangrove swamps! Anyways I'm glad I didn't incur the wrath of the river police (yet).

@valadaar: There's a tutorial around here somewhere... let me see... here it is. It's basically a straight export from Fractal Terrains. Although I've found that a combination of median filter + surface blur will give you very nice results.

-Rob