Russia’s colour-named sea freezes half the year
The White Sea is a Barents inlet on northwest Russia, ringed by Karelia, the Kola Peninsula, and Kanin. Arkhangelsk made it the country’s historic oceanic door for Pomor traders; in winter from roughly October to May the surface itself turns to ice.
The IHO draws the northern limit from Svyatoy Nos to Cape Kanin. Four gulfs meet the Barents through the Gorlo—Russian for throat—while Kandalaksha Gulf plunges to about 340 metres, the basin’s deep pocket. Solovetsky Islands dominate the centre near Onega Bay; Kiy and Velikiy add monastery and nearshore lore. Seabeds mix silt, sand, and stones; Ice Age deposits still shoulder many coasts.
Rivers deliver about 215 cubic kilometres of fresh water yearly, the Northern Dvina alone up to 171 in wet years, with Mezen, Onega, Kem, and Vyg adding tens more. Storms peak in October–November; shallow depths keep typical waves near one metre, occasionally three to five. Polar-to-subarctic fog and cloud rule; February air can sit near −15°C over much of the sea.
Novgorodians knew these waters by the 11th century, prizing them for shipping and for coastal forests full of fur animals. Kholmogory, on the Northern Dvina, grew up in the late 14th century, and in 1492 a grain fleet carrying Ivan III's envoys sailed from there to Denmark, founding Russia's first international seaport. Richard Chancellor's Edward Bonaventure arrived in 1553 while seeking a northern route to the Indies, Dutch traders followed, and Ivan IV opened a new port downriver in 1584. The sea stayed Russia's main trade route until Saint Petersburg, founded in 1703, offered an ice-free Baltic outlet, and from the 1920s most northern shipping moved to Murmansk. The White Sea is one of four seas named after a colour, with the Black, Red and Yellow.
From October or November to April or May the sea freezes, with January water near −1.9 °C in the north and a little warmer in the bays. Salinity climbs from 24 to 26 parts per thousand in the centre to about 34 toward the Barents Sea. In summer the central surface reaches 15 °C, while the north stays at 7 to 8 °C because shallow water mixes with the cold bottom layer, and below about 100 m the water holds steady at −1.4 °C.
Source: White Sea
