The Chōshū Domain (長州藩 Chōshū han) was a feudal domain of Japan during the Edo period (1603–1867). It occupied the whole of modern-day Yamaguchi Prefecture. The capital city was Hagi. The name Chōshū was shorthand for Nagato Province. The domain played a major role in the Late Tokugawa shogunate. It is also known as the Hagi Domain (萩藩 Hagi han).