From A Wiki of Ice and Fire
Dagger Lake is a large lake that is formed by the confluence of the rivers Rhoyne and Qhoyne in western Essos. At Dagger Lake the Qhoyne comes rushing in, full of gold and amber from the Axe and pine-cones from the Forest of Qohor. Northeast of Dagger lake are the ruins of Ar Noy, while along its western banks are the Golden Fields.
A Dance with Dragons
The Shy Maid passes Dagger Lake by night, unseen and unmolested by pirates.