The Riverine Culture, or the Rivermen, were a major culture along the Great River of Zitis. Until their decline, they were the dominant cultural force in Zitis, and also the largest and most populous culture. The first civilization to sedenterize and urbanize, they greatly influenced the cultures of the Wajahe, Ejee, Dajitti (and earlier Zuu6), Imyes, and Wzetsyew. They pioneered the major regional and international trade routes, including the Purple Road, and would lay the groundwork for much of the modern economic strength of the Wajahe. There were 3 groupings of the Rivermen - the Yisa, Wisa, and Gwesa, corresponding roughly to the Lower, Middle, and Upper sections of the great river.