Valley basin runs between the Panamint Range to the east and Argus and Slate ranges to the west for 65 miles (105 km). It has a width of about 10 miles (16 km). It is an endorheic basin that can form a lake after heavy rain. Airspace above the valley is part of the Panamint Military Operating Area, restricted to US military use. The ghost town of Ballarat had 400 residents at the turn of the 20th century when mines were active in the area. Racetrack Playa Racetrack Playa is a seasonally dry lake (playa) located in the northern part of the Panamint Mountains that is famous for rocks that mysteriously move across its surface. During periods of heavy rain, water washes down from nearby mountain slopes onto the playa, forming a shallow, short-lived lake. Most of the so-called 'sailing stones' are from a nearby high hillside of dark dolomite on the south end of the playa. Similar rock travel patterns have been recorded in several other playas in the region but the number and length of travel grooves on The Racetrack are notable. Racetrack stones only move once every two or three years and most tracks last for just three or four years. Rainbow Canyon Rainbow Canyon is a canyon near the western edge of the park. It is commonly used by the United States Military for fighter jet training and is frequented by photographers who, from the canyon rim, are able to photograph jets flying beneath them. Red Cathedral Red Cathedral is a geological formation located between highways 178 and 190. Formed of steep cliffs, it is composed of red colored oxidized rocks and is visible from Zabriskie point and the Golden Canyon trail. Saline Valley Salt Creek Much of Salt Creek is usually dry at the surface and covered by a bright layer of salt which was created by many flooding and subsequent evaporation of water that periodically flows at the surface. Over time the small amount of solutes in the water accumulate to form this linear salt pan. Another part of salt creek runs with brackish water year-round. It is here that the last survivor of Lake Manly resides; the Death Valley pupfish. Saratoga Springs Saratoga Springs () is a desert oasis located in southern Death Valley National Park. The wetland lies at the southern tip of the Ibex Hills, on the floor of Death Valley