Tartu is the second largest city in Estonia after Tallinn. Tartu has a population of 97,435. It is 186 kilometres southeast of Tallinn and 245 kilometres northeast of Riga, Latvia. Tartu lies on the Emajõgi river, which connects the two largest lakes in Estonia, Lake Võrtsjärv and Lake Peipus. From the 13th century until the end of the 19th century, Tartu was known in most of the world by variants of its historical name Dorpat.