From A Wiki of Ice and Fire
Widow's Watch is the seat of House Flint of Widow's Watch. It is located on the eastern side of the continent and sits near the coast of the narrow sea.
A Clash of Kings
When Lyessa Flint declined the invitation to the harvest feast at Winterfell, one of her reasons was a sickness at Widow's Watch.
A Storm of Swords
Maester Aemon sent a raven to Widow's Watch in a plea for help to defend Castle Black from wildlings.
References and Notes