Another notable restriction to attendees is the 9.2-mile (14.8 km) long temporary plastic fence that surrounds the event and defines the pentagon of land used by the event on the southern edge of the Black Rock dry lake. This 4-foot (1.2-meter) high barrier is known as the "trash fence" because its initial use was to catch wind-blown debris that might escape from campsites during the event. Since 2002, the area beyond this fence has not been accessible to Burning Man participants during the week of the event.