The Seine (/ s eɪ n, s ɛ n / sayn, sen, [1] French: ⓘ) is a 777-kilometre-long (483 mi) river in northern France. [2] Its drainage basin is in the Paris Basin (a geological relative lowland) covering most of northern France. [3] It rises at Source-Seine, 30 kilometres (19 mi) northwest of Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English ...