The North Pole (Patreon)

Technically CFS Alert (https://en.wikipedia.org/wiki/CFS_Alert) is about 800 plus kms from top of the world.

Though the BV206 (https://en.wikipedia.org/wiki/Bandvagn_206) could probably make it (if it didn't break down) I'm not sure it would have enough fuel to make it back.

Though if I ever tried, I'm pretty sure doing this would be a bad idea.