Unlike most US national parks, there are no places within North Cascades National Park where one can drive to a campground. There are many vehicular access camp grounds in Ross Lake National Recreation Area and in surrounding national forests. All overnight camping is considered backcountry camping and camping areas are protected to prevent overcrowding. Permits can be obtained at the Wilderness Information Center near Marblemount. Since the vast majority of the park is designated wilderness, the goal is to ensure all hikers and backcountry travelers enjoy the opportunities for solitude. Group sizes are limited to parties of less than a dozen on what are known as trail and camping corridors, and in more remote areas off trails, groups larger than six are not permitted. Backcountry camping spots can be reserved in early spring only; all visitors must obtain a permit for the reservation by visiting the Wilderness Information Center.