Classroom lesson · Saguia el-Hamra Wadi · 🇪🇭 Western Sahara

Saguia el-Hamra Wadi

The 'Red River' that only flows after rain

Photo · Wikimedia Commons

What is it?

Saguia el-Hamra means 'Red Channel' in Arabic, named for the rusty red colour of the soil along its banks. It is a wadi — a river valley that is dry most of the time but fills with rushing water when rain falls far away in the mountains. Even when dry, the wadi is a green strip of life in the desert.

Tell me more

A wadi looks like a river but works differently. Instead of flowing all year, it only fills during heavy rainstorms. The water can rush through in hours and then disappear back underground, leaving the sandy channel dry again. Even so, the soil along a wadi holds moisture long after the surface dries, so plants and animals gather here.

The name 'Red Channel' comes from the reddish iron-rich soil that colours the riverbanks. After a rare rainstorm, the water picks up this red soil and carries it downstream, making the whole flow look orange or brick-red — quite spectacular to see from a hillside.

People have lived along the Saguia el-Hamra for a very long time because the wadi offers something rare in the desert: underground water close to the surface. Wells dug near the wadi banks reach water more easily than wells dug in open desert, making the wadi corridor a natural corridor for travel and settlement.

In the classroom

Walk your class through this in 15 minutes.

Talk together

Discussion prompts

01Why would travellers in the desert try to follow a wadi even when it is completely dry?
02Rain falls far away and then causes a flood somewhere else. Can you think of other examples where something happens in one place and affects a different place?
03If you could only drink from a wadi that fills once a year, how would you store enough water for the rest of the year?

Try this

Classroom activity

Build a model wadi using a plastic tray filled with dry sand shaped into a shallow channel. Tilt the tray slightly and slowly pour a cup of coloured water at the top end. Watch how fast it moves and where it disappears. Draw what you see.

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