Everyone here thought of fking flying over this **** including me, it doesn't need to be a genius to do something so simple but our mc seems to be above a genius....
Good thing you're not the MC. If you could think of such an obvious solution then clearly the church can too. You think they are going to set up a fortress along a border and be totally helpless against a flying mage? If anything that mage is going to be the most obvious target in the world.