The North Cascades offer many challenges. Here, the PCT climbs up a deep canyon to a high mountain pass, only to descend another deep canyon and repeat the cycle. The trail traverses popular Alpine Lakes, Henry M. Jackson and Glacier Peak Wildernesses before entering the Lake Chelan National Recreation Area, North Cascades National Park and Pasayten Wilderness. The prime attraction is Glacier Peak, and the rugged route around it offers a memorable experience to trail users. Not only is the North Cascades Range rugged, it is the wettest along the route, lying in a storm track most of the year. This precipitation has produced about 750 perennial snowfields and small glaciers, which collectively account for about half the snowfield area in the lower 48 states.