I think OP is asking if the world wraps around. No, it doesn't. Coordinates are fixed.
The easiest way to get to him/her without making a new character is to make a party. You'll need to kin each other first by using a Hearth Secret (commonly HS), which is set on your Kin window (the two text boxes below). The left box sets your hearth secret, the right is used to add another player as kin using their HS. After you form a party, click on the other player's portrait and you'll start walking their direction. It can take a very long time to get to them, though, and you'll most definitely need a boat. Feel free to take one that's just laying around and not on a claim. (Their fault if they left it laying around.)
pretzelguy1 wrote:So to go Northeast you would go right on your screen?
Isometric views almost always have North towards the upper-right corner, so yes, NE would be directly to the right of the window. You can always follow the minimap movement to make sure you're traveling correctly.

Opinions expressed in this statement are the authors alone and in no way reflect on the game development values of the actual developers.