"Sorry - tsunami are these big fuckoff waves that form when there's an earthquake off the coast. Like twenty feet high, wipe out whole towns, kinda thing. If your planet gets them, then you know what I mean. They can be a problem where I live, but not regularly and not as far inland as my home town, generally."

She frowns a little. "Why not live on boats, then? If there's no way to tell. Hell, why live there at all? Did your people like, evolve there?"