the Twilight Rivulet (WoW)  

The Twilight Rivulet is a small river in Crystalsong Forest that runs from the Decrepit Flow in the northwest down to the Mirror of Twilight below Dalaran in western Crystalsong Forest. This river skirts the Forlorn Woods to the northeast and the Violet Stand to the west as it comes out of the decrepit flow.

Wrath of the Lich King required!