From Tolkien Gateway
|Location||Eastfarthing south of the Woody End|
|Description||Minor tributary of the River Shirebourn|
Thistle Brook was a stream of the Eastfarthing of the Shire. From Green Hill Country it flowed south-east round Woody End and through the village of Willowbottom before its waters emptied into the River Shirebourn.
Thistles presumably grew around it.