Which country contains the Masurian Lake District?

Poland

Which fungus can be used to leaven bread dough through natural fermentation? Which metal increases steel's resistance to rust when alloyed? What scientific discipline focuses on the study of fungi? What game, released in 2011 by Mojang, involves exploring a blocky, procedurally generated 3D world? Which multiplayer FPS has operators defending or attacking strategic objective locations, developed by Ubisoft?