Minecraft wiki entry for Village, associated text: Villages generate paths between the buildings and extending outside of the village. Village paths generate at the level of existing terrain, potentially going up steep hills or down ravines without regard for whether an entity could actually traverse the path. Paths do not go below sea level and replace only grass blocks (with air above), water, lava, sand, sandstone, and red sandstone; all other blocks are ignored and the blocks underneath are considered for replacement instead. Villagers use these paths to travel across the village.