Juan Carlos Munoz / Aerial view of the trench of the Great Rift valley, Tanzania, Africa, August 2009

Anup Shah / Aerial view of Lake Eyasi and The Great Rift Valley Escarpment, Tanzania

Yva Momatiuk & John Eastcott / White Rhinoceros (Ceratotherium simum) male, Lake Nakuru National Park, Kenya

Anup Shah / Aerial view of the Sugata river, Sugata valley in the Great Rift Valley, Northern Kenya

Anup Shah / Aerial view of Mabuyatom volcano, Lake Turkana, Great Rift Valley, Northern Kenya

Anup Shah / Flamingos on shores of Lake Logipi, Great Rift Valley, Northern Kenya

Anup Shah / Aerial view inside crater of Mt Longohot, Mount Longonot NP, Kenya

Anup Shah / Aerial view of gorge, Hell's Gate NP, Great Rift Valley, Kenya

Gerry Ellis / Soda and algae formations near shore of Lake Natron, Great Rift Valley, Tanzania

Christophe Courteau / Hot spring among Palm trees. Average water temp 37 - 40 °C. Great Rift Valley, Awash National Park, Ethiopia. 750m altitude.

Christophe Courteau / Hot spring among Palm trees. Average water temp 37 - 40 °C. Great Rift Valley, Awash NP, Ethiopia. 750m altitude.

Juan Carlos Munoz / Pied kingfisher (Ceryle rudis) perched on a branch, Lake Baringo, Great Rift Valley, Kenya, Africa