From A Wiki of Ice and Fire
Blackbottom Bend is a place near Acorn Hall in the riverlands.
A Storm of Swords
Lady Ravella Smallwood believes that a group of Karstarks went to Blackbottom Bend after failing to find Ser Jaime Lannister at Acorn Hall.
- ↑ 1.0 1.1 A Storm of Swords, Chapter 22, Arya IV.