道加瓦河
Torņakalns is a neighbourhood of Riga, Latvia. Located on the western bank of the Daugava River (neighborhoods along this shore are collectively known as Pārdaugava). The name Torņakalns ("eng.:Tower Hill") derives from a fortified tower built in the Middle Ages close to the Daugava River to alarm the city of Riga in case of emergency and unwelcomed intruders about to cross the river. The tower does not stand nowadays.