The Dark Tower Wiki

Devar-Tete Whye is a river that runs east of all Callas.

Devar Tete Whye

The river, outlined in yellow.

It is connected to Devar Whye river, and is also west of Algul Siento. In the shore of the eastern side of the river, it's located The Dogan, the place Ben Slightman the Elder used for communications with the people of the Thunderclap.