Young African elephant, Loxodonta africana, at waterhole, Addo National park, South Africa, Africa

Desert-dwelling Elephant, (Loxodonta africana africana), Dry River, Hoanib, Kaokoland, Namibia

Bourke's Luck potholes, Drakensberg Mountains, South Africa, Africa

African elephant, Loxodonta africana, bathing in water, Greater Addo National Park, South Africa, Africa

African elephants, Loxodonta africana, mother and young, Addo Elephant Park, Eastern Cape, South Africa, Africa

Hippopotamus (Hippopotamus amphibius), Busanga Plains, Kafue National Park, Zambia, Africa

White rhinoceros (rhino), Ceratotherium simum, cooling off, Itala Game Reserve, South Africa, Africa

African elephant, Loxodonta africana, bathing and covering itself in mud, Greater Addo National Park, South Africa, Africa

Bourke's Luck Potholes, created by river erosion, Blyde River Canyon, Mpumalanga, South Africa, Africa

Hot springs and mud pools, Salar de Uyuni, Bolivia, South America

Cavers in County Pot in the Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

A very badly potholed section of road at Troutbeck Bridge in South Cumbria, England, United Kingdom, Europe

Jeff Crystol foreground and Josh Williams in backround descending Miners Hollow or Knotted Rope Canyon, San Rafael Swell, Utah.