North Johnstone River, Australia - This stunning trip in the tropical far north of Queensland offers Class IV and V white water amidst volcanic gorges and the ancient rain forests of Palmerston National Park.
At night luminous fungi glow surreally on the rocks and fireflies dance shimmering arabesques through the forest canopy. A bonus thrill is the helicopter ride taking you to the start of the course, which is accessible only by air.
Sun Kosi River, Nepal Rising near the border with Tibet, among the world's highest peaks, the Sun Kosi offers a trip of Himalayan majesty on its way to join the Ganges on the plains below. Class V rapids abound as it thunders through narrow gorges and forested canyons. The final stretch takes you through dense tropical jungle where monkeys chatter from the trees.
Çoruh River, Turkey The Çoruh is one of the world's fastest-flowing rivers, cutting through breathtaking gorges in the remote and dramatically beautiful Kaçkar Mountains of far northeastern Turkey. Wildlife abounds, from bears to mountain goats to wild boar—as well as fascinating historical ruins, including castles dating from the time of the Byzantine Empire.
Noce River, Italy Fed by melting Alpine glaciers, the Noce tumbles through the wild, remote Val di Sole (Sun Valley) in the Dolomites of northern Italy. It offers some of the most exciting whitewater rafting in Europe, including a spectacular series of Class V rapids as it roars through the gorges of Mostizzolo.
Zambezi River, Zimbabwe/Zambia The Batoka Gorge, where the Zambezi boils and churns its way over 23 rapids in a 15-mile (24-kilometer) stretch below the Victoria Falls, gives Africa's most thrilling whitewater experience against one of the most dramatic river backdrops in the world.