From Tolkien Gateway
Old Man Willow by John Howe

Willows were waterside trees that grew throughout Middle-earth. The most famous of these was the ancient tree known as Old Man Willow, on the banks of the Withywindle in the Old Forest.[1]

In Beleriand was the region Nan-tathren, a wooded vale which took its name from the willow trees that grew there.[2]

Other names

The Sindarin name for "willow" is tathar.[3]

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