The Weser is a major river in northwestern Germany, flowing approximately 452 kilometers (280 miles) from its source in the Teutoburg Forest to its mouth at the North Sea. It is the longest river entirely within Germany and serves as an important waterway for transportation and trade. The river passes through several cities, including Bremen and Minden, and is known for its scenic landscapes and recreational opportunities. The Weser is also part of the Weser River Basin, which supports diverse ecosystems and wildlife, making it a vital natural resource for the region.