ToME: the Tales of Maj'Eyal

Thanks! Hadn't realized diagonal travel was possible when I posted. Figured it out now.

I'm a few hours into my first game of ToME4. I made it through the Scintillating Caves and the Rhaloren Camp, killing the bosses for both. Now I realize that it appears that, on the worldmap, I'm trapped on a small island that has only the first town and those two initial dungeons. Is there a way to...