Arid lands, surprisingly, contain some of the world's largest river systems, such as the Murray-Darling in Australia, the Rio Grande in North America, the Indus in Asia, and the Nile in Africa.

令人惊讶的是，干旱地区拥有着世界上最大的一些河流系统，如澳大利亚的墨累-达令河、北美的里奥格兰德河、亚洲的印度河和非洲的尼罗河。

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Its colour comes not from pollution but from mud and sunlight as the Darling slowly wends its way between narrow, steep banks to meet the Murray River and then the ocean 2, 400km south.

ECONOMIST: A land of drought