The Serre (French pronunciation: [sɛʁ] ^ⓘ) is a tributary of the river Oise in northern France, in the departments of Ardennes and Aisne. Its source is in the small village of La Férée, Ardennes, from which it flows west into the Aisne department. It flows through Montcornet, Marle and Crécy-sur-Serre and joins the Oise at La Fère. Its total length is 95.9 kilometres (59.6 mi).^[1]

Serre
Location
Country	France
Physical characteristics
Source
• location	near La Férée
• coordinates	49°45′49″N 4°19′00″E / 49.76361°N 4.31667°E / 49.76361; 4.31667 (Serre source)
Mouth
• location	Oise
• coordinates	49°40′41″N 3°23′31″E / 49.67806°N 3.39194°E / 49.67806; 3.39194
Length	96 km (60 mi)
Basin features
Progression	Oise→ Seine→ English Channel