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Location of the Gulf of Finland with respect to the Baltic region.

The Gulf of Finland (Finnish: Suomenlahti, Russian: Финский залив, Swedish: Finska viken, Estonian: Soome laht) is the easternmost arm of the Baltic Sea that extends between Finland (to the north) and Estonia (to the south) 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. The eastern parts of the Gulf of Finland belongs to Russia and some of Russia's most important oil harbours are located furthest in, near Saint Petersburg.

the Gulf of Finland has an area of 29,500 km², its length is 428 km and it is 120 km wide. The width at the mouth of the gulf is 75 km and the distance from Porkkala to Rohuneeme, outside Tallinn, is 52 km. The gulf narrows in the east, eventually becoming the 10–28 km wide Gulf of Kronstadt. The largest bay on the northern coast is the Gulf of Vyborg, and in the south Narva Bay.

There are several islands in the Gulf of Finland. Gogland, Tyters, Lavansaari and Seiskari are among the largest of these. The deepest parts of the gulf can be found at the mouth of the gulf, where there is a deep with a depth of 80–100 meters. There are even depths of over 100 meters at the southern coast, while the depths at the northern coast never exceeds 60 meters. The deepest point, 121 m, is at the Estonian coast, just northeast of Tallinn. About 5% of the water mass in the Baltic Sea is located in the Gulf of Finland.

The ocean currents are trying to move clockwise on the northern hemisphere (due to the Coriolis effect), and therefore the currents are moving eastwards in near the Finnish coast, and westwards near the Estonian coast. The water is sweeter further in in the gulf, because of the large river Neva, which has its outlet there.

The huge eutrophication of the Gulf of Finland is the biggest problem for the sea – algal bloom, which occures during summers, can cover large areas.

• Espoo
• Hamina
• Hanko
• Helsinki
• Kotka
• Kronstadt
• Loviisa
• Maardu
• Paldiski
• Porvoo
• Saint Petersburg
• Sillamäe
• Sosnovy Bor
• Tallinn
• Vyborg

Gulf of Finland

• Bolshoy Tyuters (Tytärsaari)
• Hogland (Suursaari)
• Kotlin Island
• Lavansaari
• Naissaar
• Seiskari

• Peter the Great's Naval Fortress
• Kven Sea

• ESA satellite photograph of the Gulf of Finland

Coordinates: 59°53′N, 26°06′E