u/notme_definitely

I found this Ultima 6 map in a box of childhood toys and Google image search informed me about this game. Seems like people collect it, so I wanted to check in with you if it's worth selling, where (in EU), and how much should I ask if yes.
My brother was/is a computer geek so pretty sure it's original from his PC game (but he doesn't care about it anymore). It in pretty good condition just a bit dusty, the cloth seems steady and there is no weird smell.
Thanks for your help!