Sheer red cliff walls, deep flowing green water, walking tracks, and Aboriginal sites are the features of this spectacular Outback oasis. World Heritage-listed Riversleigh is part of Lawn Hill's fossil section. This is a very remote area, and you really need a four-wheel drive to access it. A better option is to take a 3-day, 2-night safari tour from Mount Isa with Kalkatungu Aboriginal Guided Tours (book through Outback @ Isa, tel. 07/4749 1555). The tour costs A$1,290 adults, A$645 children 5 to 15, and A$323 children under 5. Your guide will be a member of the Waanyi Aboriginal tribe, the traditional owners of these lands. The tour includes 2 nights' accommodation at Adel's Grove (www.adelsgrove.com.au); all meals; canoe hire; and transfers. The tour takes you to Riversleigh's fossil fields, walking in the national park, to Aboriginal rock painting sites, canoeing on Lawn Hill Creek, and swimming in the natural spa. It only operates April to September.