Which river shown on the map indicates the farthest extent of Alexander's conquests ​

Indus river

The river shown on the map that indicates the farthest extent of Alexader's conquests is the Indus river. In his thirty-two years of life, his empire extended from Greece, to the Indus Valley in the East and to Egypt in the West, where he founded the city of Alexandria .

Explanation:

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c) troops march forward in close formation against newer, more accurate weapons