The top section of the river's course leads through a hilly region called the Weserbergland[?]. It extends from the confluence of Fulda and Werra to the Porta Westfalica, where the Weser runs through a gorge between two mountain chains, the Wiehengebirge in the west and the Wesergebirge in the east.
Towns at the Weser, from the source to the mouth: Hannoversch Münden, Beverungen[?], Höxter[?], Holzminden[?], Bodenwerder[?], Hamelin, Hessisch-Oldendorf[?], Rinteln, Vlotho[?], Bad Oeynhausen[?], Porta Westfalica, Minden, Petershagen[?], Nienburg[?], Achim[?], Bremen, Brake[?], Nordenham[?], Bremerhaven.
The largest tributary of the Weser is the Aller river, that joins the Weser before Bremen.