The Gulf of Riga, Bay of Riga, or Gulf of Livonia ( lv, Rīgas līcis, et, Liivi laht) is a bay of the

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from ...

between

Latvia Latvia ( or ; lv, Latvija ; ltg, Latveja; liv, Leţmō), officially the Republic of Latvia ( lv, Latvijas Republika, links=no, ltg, Latvejas Republika, links=no, liv, Leţmō Vabāmō, links=no), is a country in the Baltic region of ...

and

Estonia Estonia, formally the Republic of Estonia, is a country by the Baltic Sea in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the sea across from Sweden, to the south by Latvia, a ...

. The island of Saaremaa (Estonia) partially separates it from the rest of the Baltic Sea. The main connection between the gulf and the Baltic Sea is the Irbe Strait. The Gulf of Riga, as a sub-basin of the Baltic, also includes the Väinameri Sea in the West Estonian archipelago.

Geography

Extent

The

International Hydrographic Organization The International Hydrographic Organization (IHO) is an intergovernmental organisation representing hydrography. , the IHO comprised 98 Member States. A principal aim of the IHO is to ensure that the world's seas, oceans and navigable waters a ...

defines the Gulf of Riga's western limit as "A line running from Lyser Ort (57°34'N), in Latvia, to the South extreme of Œsel Island, through this island to Pammerort (22°34'E), thence to Enmast Point, the S extreme of

Dagö Dagö is a folk rock band from Tallinn, Estonia. Dagö was formed in 1998 by Lauri Saatpalu, Peeter Rebane and Tiit Kikas. Dagö is the old name of Hiiumaa, an Estonian island. The band's first album, ''Dagö'', was released in 2000, and receiv ...

, through Dagö to Takhkona Point, the North extreme thereof, and on to Spithamn Point in Estonia".

Islands

Major islands in the gulf include Saaremaa,

Kihnu Kihnu is an island in the Baltic Sea. With an area of it is the largest island in the Gulf of Riga and the seventh largest island of Estonia. The length of the island is and width , the highest point is at above sea level. The island belongs ...

, and

Ruhnu Ruhnu ( sv, Runö; german: Runö; lv, Roņu sala) is an Estonian island in the Gulf of Riga in the Baltic Sea. It is administratively part of Saare County but is geographically closer to the Latvian mainland. At , it has currently fewer than 100 ...

, which are all controlled by

. Kihnu covers an area of . Saaremaa island is responsible for the brackish water of the Gulf of Riga, as it is partially "shielded" from the Baltic Sea. The Baltic itself is already less salty than the global oceanic average, but this effect has a North-South and East-West gradient.

Cities

Notable cities around the gulf include

Riga Riga (; lv, Rīga , liv, Rīgõ) is the capital and largest city of Latvia and is home to 605,802 inhabitants which is a third of Latvia's population. The city lies on the Gulf of Riga at the mouth of the Daugava river where it meets the Ba ...

, Pärnu, Jūrmala, and

Kuressaare Kuressaare () is a town on Saaremaa island in Estonia. It is the administrative centre of Saaremaa Parish and the capital of Saare County. Kuressaare is the westernmost town in Estonia. The recorded population on 1 January 2018 was 13,276. Th ...

. The main rivers flowing into the gulf are Daugava, Pärnu,

Lielupe The Lielupe ( in Latvian literally: ''Large River'', lt, Lielupė, german: Kurländische Aa) is a river in central Latvia. Its length is (the length would reach if the Mēmele River were counted as part of the Lielupe). The surface area of ...

, Gauja, and

Salaca The Salaca () is a river in northern Latvia. It flows from Lake Burtnieks in Vidzeme, 90 km, to the Gulf of Riga. The river flows through three towns, Mazsalaca, Staicele and Salacgrīva. The riverbanks feature Devonian red sandstone c ...

Salinity

The freshwater runoff entering the Baltic sea accounts for two percent of its volume. A narrow connection to the North Sea means that water stays in the Baltic for an average of 30 years. These two characteristics work to make the Baltic Sea one of the largest

brackish Brackish water, sometimes termed brack water, is water occurring in a natural environment that has more salinity than freshwater, but not as much as seawater. It may result from mixing seawater (salt water) and fresh water together, as in estuari ...

bodies of water in the world. The Gulf of Riga has an average salt concentration for the Baltic Sea, which is around six to ten parts per thousand. Freshwater has a concentration of 0.5 parts per thousand, and seawater is about 30 parts per thousand. A saline stratification layer is found at a depth of approximately .C.Michael Hogan. 2011. ''Gulf of Riga''. Encyclopedia of Earth. Eds. P.Saundry & C.J.Cleveland. National Council for Science and the Environment. Washington DC.

Winter

In winter, most or all of the Bay occasionally freezes. This is due to low salinity and the calming effect of the partial closure of the entrance of the gulf. During the winter, many people walk over the bay. The thickest recorded ice was thick in the winter of 1941–42. Ice hole fishing has been a traditional source of winter food, and remains a common activity. The ice usually melts between March and April. In late March 2013, when the ice started to melt, 200 people had to be rescued from ice floes.

Geography

Extent

Islands

Cities

Salinity

Winter

See also