Post Greyhawk Wars: 585 CY
This is a long, broad, deep artery important as a trade route within Nyrond and the Duchy of Urnst. It allows vessels to pass from the Nyr Dyv to the Sea of Gearnat. The Nesser lowlands are exceptionally fertile, with rich, dark soils. The Duntide is likewise a slow, broad water after its first fifty or so miles from the Flinty Hills. Both rivers are navigable for their entire lengths (save for the northenmost Duntide waters), although the Nesser is slow traveling within the Gnatmarsh. The Franz tributary of the Nesser is a natural border between Nvrond the County of Urnst.