It was the river that is said to have watered the biblical Garden of Eden and helped give birth to civilisation itself. But today the Tigris is dying.
Human activity have choked its once mighty flow through Iraq, where — with its twin river the Euphrates — it made Mesopotamia a cradle of civilisation thousands of years ago.
Iraq may be oil-rich but the country is plagued by poverty after decades of war and by droughts and desertification.
Battered by one natural disaster after another, it is one of the five countries most exposed to climate change, according to the UN.
From April on, temperatures exceed 35 degrees Celsius (95 degrees Fahrenheit) and intense sandstorms often turn the sky orange, covering the country in a film of dust.
Hot summers see the mercury top a blistering 50 degrees Celsius — near the limit of human endurance — with frequent power cuts shutting down air-conditioning for millions.
The Tigris, the lifeline connecting the storied cities of Mosul, Baghdad and Basra, has been choked by dams, most of them upstream in Turkey, and falling rainfall.
The Tigris’ journey through Iraq begins in the mountains of autonomous Kurdistan, near the borders of Turkey and Syria, where local people raise sheep and grow potatoes.
According to Iraqi official statistics, the level of the Tigris entering Iraq has dropped to just 35 percent of its average over the past century.