The Three Sisters

The Three Sisters is an archipelago composed by three islands. It is located in the massive bay known as The Bite, south of White Harbor and Oldcastle. The Three Sisters are part of the Seven Kingdoms and their lords fall under the authority of the Lords Paramount of the Vale.

In the books
In the A Song of Ice and Fire books the Three Sisters are ruled by House Sunderland of Sisterton, the main port of the archipelago. Each island - Sweetsister, Longsister and Littlesister - is ruled by a vassal house of the Sunderlands: House Borrell of Sweetsister, House Longthorpe of Longsister, and House Torrent of Littlesister.

Septons consider the Three Sisters as dens of avarice and sin. Men from these islands are known as 'Sistermen'. In centuries past, Sistermen resorted to raiding along the southern coast of the North.