desert is one which gives rise to the heat lows which help drive the NW monsoon. There, almost all rain comes from monsoon thunderstorms or the occasional tropical cyclone rain depression. Frost does not occur in most of the area in the far north. The regions bordering the Gibson Desert in the far southeast may record a light frost or two every year, with frost being more prevalent in the Tanami region. Away from the coast winter nights can still be chilly in comparison to the warm days. Minimum winter temperatures dip to in most parts of the desert. Tourism Tourism is a major industry across the Great Australian desert, and commonwealth and state tourism agencies explicitly target Outback Australia as a sought after destination for domestic and international travelers. Tourism Australia explicitly markets nature-based and Indigenous-led experiences to tourists. In the 2015–2016 financial year, 815,000 visitors spent $988 million while on holidays in the Northern Territory alone. At Katjarra, there are two camping spots, with shed tanks and long-drop toilets, and Indigenous rangers are available to show tourists the part of the range that is open to the public. Riversleigh, in Queensland, is one of Australia's most renowned fossil sites and was recorded as a World Heritage site in 1994. The 100 km2 (39 sq mi) area contains fossil remains of ancient mammals, birds and reptiles of Oligocene and Miocene age. There are several popular tourist attractions in the desert, which include: Arkaroola and Wilpena Pound in the Flinders Ranges Australian Stockman's Hall of Fame Devils Marbles Kakadu National Park Kata Tjuta (The Olgas) Katherine Gorge Kings Canyon (Watarrka) MacDonnell Ranges Monkey Mia Mount Augustus National Park Uluru (Ayers Rock) Willandra Lakes Region Lake Mungo Gawler Ranges National Park Gawler Ranges Conservation Park Great Victoria Desert Nature Reserve Lake Gairdner National Park Mamungari Conservation Park Munga-Thirri National Park Karlamilyi National Park Mount Willoughby Indigenous Protected Area Nullarbor Regional Reserve Pureba Conservation Park Queen Victoria Spring Nature Reserve Tallaringa Conservation Park Watarru Indigenous Protected Area Yellabinna Regional Reserve Yellabinna Wilderness Protection Area Yumbarra Conservation Park Black Rock Conservation Park Bon Bon Station Conservation Reserve Bunkers Conservation Reserve Caroona Creek Conservation Park Coongie Lakes Ramsar Site Danggali Wilderness Protection Area Ediacara Conservation Park Elliot Price Conservation Park Gawler Ranges National Park Hiltaba Nature Reserve Ikara-Flinders Ranges National Park Ironstone Hill Conservation Park Kanku-Breakaways Conservation Park Kati Thanda-Lake Eyre National Park Kinchega