尽管一些河流被重新殖民，但原始种群的独特基因已经消失。
Although some rivers have been recolonized, the unique genes of the original populations have been lost.
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。
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.
国际性河流的流域涉及145个国家的边界，其中一些河流流经数个国家。
International river basins extend across the borders of 145 countries, and some rivers flow through several countries.
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