SOMETIMES TOO MUCH. Other times not enough. But if you can turn a tap in your house, and drink what comes out, you’re one of the lucky ones.

One of the world's iconic rivers, the Mekong viewed from Chiang Khan, Thailand, looking out at the Laos hills.

Fisherman with a meagre catch in Chiang Saen, Thailand. The Mekong River forms part of the border with Laos.

A moat filled with lotus surroudns the 11th century Khmer temple Muang Tam. The number of visitors is low, with the most famous Khmer temple in Thailand, Phanom Rung, nearby.

To the north of the town of Luderitz, the Atlantic Ocean meets the Namibian desert sands at Agate Bay.

On the Luderitz Peninsula of Namibia's south, bays and lagoons of green and pruple plant life are a world away from the sand-dunes which surround the town.

The Okavango River boasts some fine wildlife viewing in both Namibia (here) and in the delta in Botswana.

A stone archway marks the end of tours through the stunning former diamond concession, Sperrgebeit, in Namibia's south.

The Atlantic meets the desert on Namibia's Skeleton Coast, so named for its many shipwrecks. Stark, desolate and beautiful, the area's limited flora and fauna survives thanks to the morning fogs which bring moisture in the absence of rain.

The Philippine island of Bohol is simply beautiful, covered in forests, hills, paddies and green rivers like this.

An early morning view of Gunbower Creek, which surrounds Australia's largest inland island, Gunbower.

Lake Reedy is just one of many important lakes and wetlands in northern Victoria which support Australia's birdlife.

The lands around Sittwe and Maruk U are woevn with the distributaries of the Kaladan and Lemro rivers emptying into the Bay Of Bengal.

Knowledge of water has always been ket to survival in Australia's outback. Clashes between clans and invading settlers were common.

In the dry outback of South Australia, the path of a river is clear when viewed from above, in the Flinders Ranges.

Typically dry for most of the time, great floods have carried tall trees through this gorge in Australia's Flinders Ranges.

In a universe far away in a different time, Cambodia's seaside town of Kampong Som was not a vassal state of Chinese mafia construction companies.

Flooding in central Cambodia is an essential part of life. Near Kampong Cham, this girl is collecting lotus stems.

A sight little changed in 700 years, the view from Cambodia's Phnom Chisor hill temple, south of Phnom Penh.