Africa's tallest dam takes shape in Ethiopia

The construction site on the Omo River in southern Ethiopia, where Africa's tallest dam is being built
Photograph: Xan Rice

The Karo ethnic group lives near the Omo river. In these traditional societies of livestock farmers, the kalachnikov rifle brought in by Sudanese refugees is displayed as a trophy and constitutes the household's wealth
Photograph: Sipa Press /Rex Features

The canoe of the Karo tribe crossing the Omo river, Ethiopia
Photograph: Remi Benali/Getty Images

In the village of Korcho, a Karo warrior overlooks the Omo river. The Karo are one of the most endangered ethnic groups in Ethiopia. They number today less than 500 individuals
Photograph: Remi Benali/Corbis

A Karo tribesman carries a gun over his shoulder as he guards his goats on a bank of the River Omo that snakes into neighbouring Kenya
Photograph: AP

A Karo boy, carrying his little sister, looks across the Omo River from the hills of Korcho
Photograph: Gianni Giansanti/Corbis