Kingdom of Yutah

Hello! I'd like to be an island nation if possible, but with enough size to ensure a degree of self-sufficiency, something like Australia. I would like to be in the northern hemisphere, wider west-east than north-south, with enough north-south spread to have a temperate region and a cold region up north. Here's a map I drew of my nation directly from my imagination (not for Yggdrasil, just as is).