Withy-weir
From Tolkien Gateway
Withy-weir was a weir in the Withywindle river. Tom Bombadil passed it during his boat-trip along the river:
- Tom came to Withy-weir. Down the river rushing
- foamed into Windle-reach, a-bubbling and a-splashing...[1]
Withy-weir is not mentioned elsewhere nor does it appear in the map A Part of the Shire.