The Clerith River flows down from the Skyfangs and fills Lake Zhosa before winding its way through the Lobrandr Hills and the Byspell Plains on its way to the Helion Sea. The Duvull River flows into it in towards the south, joining it on the way to a sandy river delta where it meets the ocean. The river is wide, deep, and slow flowing, making it an ideal passage for trading barges heading towards the sea. The river also serves as an important habitat for various freshwater fish, as well as kobolds inclined to hunt them.
The Clerith River has been important to civilization for time immemorial. Some of the earliest tribes of Dûnathel made their homes around its banks, and many of the largest modern day cities sit near it as well. The area between the Clerith and the Duvull is particularly fertile for plantlife, and both rivers have been utilized for irrigating crops. The Clerith has also become a primary home for the Byspell Plains' kobold population, providing ample swimming space and prey access for most of the families living in the area.