Svishtov (svēshtôfˈ) [key], town (1993 pop. 31,960), N Bulgaria, a port on the Danube River. It is an agricultural center with a significant fishing industry. With a history dating to Roman times, it became, under Turkish rule (15th–19th cent.), an important commercial and military center known as Sistova. The city has a 19th-century cathedral, a university, and an archaeological museum.