Sinimäed Hills

The Sinimäed Hills (or Blue Hills; Estonian: Vaivara Sinimäed) are three linked hills in northeastern Estonia. The heights which are aligned west–east, consist of Tornimägi, Põrguaugu mägi (also known as Grenadierimägi) and Pargimägi (also known as Lastekodumägi). They lie in Narva-Jõesuu municipality near the coastal town of Sillamäe in Ida-Viru County.

The hills are best known as the location of the Battle of Tannenberg Line, fought in World War II on July 26–August 12, 1944. There, the German Waffen-SS defeated a Soviet offensive.