The stone of the forests crescented around the north shore of Turtleback Lake are deeply weathered in striking and labyrinthine ways, forming miniature canyons and twisting paths that resemble the hallowed corridors of castles and fortresses. In many places the erosion is incomplete and spotty, leaving behind bridges of stone and towering tors and tea tables, all used to the pack’s advantage. Many of these routes let out directly onto a rocky strip of beach, which is used as the pack’s main water source. This area is often thick with fog in the mornings.