Le Terre Perdute

From the blurb (translated):

Those parts of Earth where humankind hasn’t been able to resist the undead awakening are now called «Lost lands» (Italian: terre perdute): these territories are wide-spreading and dangerous, as not only are they roamed by the undead but by wild beasts and ill-willed humans too. Nonetheless, even in the lost lands sparse pockets of safety and groups of mostly nomad friendly people can be found.