The Koporye Bay is a 12 km-long bay

Bay

A bay is an area of water mostly surrounded by land. Bays generally have calmer waters than the surrounding sea, due to the surrounding land blocking some waves and often reducing winds. Bays also exist as an inlet in a lake or pond. A large bay may be called a gulf, a sea, a sound, or a bight...

 on the southern coast of the Gulf of Finland

Gulf of Finland

The Gulf of Finland is the easternmost arm of the Baltic Sea. It extends between Finland and Estonia all the way to Saint Petersburg in Russia, where the river Neva drains into it. Other major cities around the gulf include Helsinki and Tallinn...

. It is up to 26 km wide and 20 meters deep. The shore is low and rocky; the hinterland is woody. It is part of Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

's Leningrad Oblast

Leningrad Oblast

Leningrad Oblast is a federal subject of Russia . It was established on August 1, 1927, although it was not until 1946 that the oblast's borders had been mostly settled in their present position...

. The only major settlement is the town of Sosnovy Bor. The Voronka and Sista Rivers drain into the bay. It is named after the medieval fortress of Koporye

Koporye

Koporye is a historic village in Leningrad Oblast, Russia, located about 100 km to the west of St. Petersburg and 12 km south of the Koporye Bay of the Baltic Sea...

which lies slightly to the south.