Most of Latvia's territory is less than above sea level. Its largest lake, Lubāns, has an area of , its deepest lake, Drīdzis, is deep. The longest river on Latvian territory is the Gauja, at in length. The longest river flowing through Latvian territory is the Daugava, which has a total length of , of which is on Latvian territory. Latvia's highest point is Gaiziņkalns, . The length of Latvia's Baltic coastline is . An inlet of the Baltic Sea, the shallow Gulf of Riga is situated in the northwest of the country.