View of the Seugne River from the Stone Bridge

The Seugne crosses a single department, in this case that of Charente-Maritime, watering thirty-six communes and seven cantons.
The Seugne has its source in the canton of Montlieu-la-Garde, then crosses the cantons of Montendre, Jonzac, Saint-Genis-de-Saintonge, Pons, Gémozac and, finally, confluences in the canton of Saintes-Est.
The Seugne has eighteen tributaries or referenced arms.

The old forms of the name Seugne are flumen Soenna around 1100, Sonye in 1280, la Soyngna in 1322, la Soyngnhe in 1354, aqua Soynnie in 1363, Souaigne in 1494. The current pronunciations, Seugne and Souègne, are based on a medieval form Soïgne, which the scribes of the 13th and 14th centuries had difficulty transcribing. According to Duguet, a more recent spelling, Seuigne was misread and interpreted Sévigne in the 19th century.