- "Tom came to Withy-weir. Down the river rushing
foamed into Windle-reach, a-bubbling and a-splashing..."
- ― Bombadil Goes Boating
The word "reach" can refer to any length of a river or to a level stretch between locks in a canal, but especially to "a straight portion of a stream or river, as from one turn to another" which is here the most probable explanation, as it gives a word-play combining windle 'winding' and reach 'straight'.