Laptev Sea

• 1. Introduction

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  The Laptev Sea sits at the northern edge of Siberia, frozen for most of the year and clear of ice for perhaps two months out of twelve. Temperatures here drop as low as -50 degrees Celsius, and in the north, the sun disappears entirely for five months at a stretch. Yet this remote, shallow sea has shaped Arctic geography, fed indigenous peoples for thousands of years, swallowed and preserved whole mammoth carcasses in its ice, and supplied more sea ice to the wider Arctic Ocean than any other sea on Earth. How did a place so hostile become so consequential? And why does a sea named after two Russian cousins carry the traces of so many other names, other peoples, and other ambitions?

• 2. A Sea of Ice

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  With an average annual outflow of 483,000 square kilometres of sea ice over the period 1979-1995, the Laptev Sea exports more frozen water than the Barents, Kara, East Siberian, and Chukchi seas combined. That figure alone tells you something about the scale of what happens here every autumn. Ice formation typically begins in September in the northern part of the sea and in October further south, though the process has been shifting later because of climate change. In 2020, record-breaking heat across Siberia pushed the start of ice formation into late October, the latest ever recorded.

  The resulting ice sheet can reach two metres thick in the south-eastern portion of the sea and along the coast. That coastal sheet extends to water depths of 20-25 metres, which can be several hundred kilometres from the shore. It covers roughly 30 percent of the sea's total area. Beyond that coastal band, ice drifts north and large open-water gaps called polynyas form wherever warm southerly winds break the cover. The most notable of these is the Great Siberian Polynya, which can stretch for many hundreds of kilometres.

  When the melt finally arrives, usually from late May to early June, the retreating ice leaves behind fragmented agglomerates of ice and, often, the visible remains of ancient mammoths. The variation from year to year is extreme: the annual outflow ranged from 251,000 square kilometres in 1984-85 to 732,000 square kilometres in 1988-89. The sea exports ice in every month except July, August, and September.

• 3. Shallow, Fresh, and Cold

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  More than half of the Laptev Sea, 53 percent, rests on a continental shelf with average depths below 50 metres. The areas south of 76 degrees North are shallower still, mostly under 25 metres. Only in the northern reaches does the sea floor drop sharply to depths of around one kilometre, covering about 22 percent of the sea's area, where it is blanketed with silt mixed with ice.

  The rivers pouring into this shallow basin carry an enormous volume of fresh water. The total annual river runoff amounts to about 730 cubic kilometres, which the source notes would form a freshwater layer 135 centimetres deep across the entire sea if spread evenly. That makes the Laptev Sea's freshwater input the second largest in the world, after the Kara Sea. The Lena River alone contributes about 70 percent of that total, or roughly 515 cubic kilometres per year. The Khatanga adds more than 100 cubic kilometres, the Olenyok 35, the Yana more than 30, and the Anabar 20.

  The freshwater inflow is so seasonal that about 90 percent of the annual runoff arrives between June and September, with 35-40 percent falling in August alone. January contributes only around 5 percent. This seasonality drives large swings in salinity: in winter the south-eastern parts of the sea register 20-25 parts per thousand, while the northern reaches read 34 parts per thousand. In summer those values drop to 5-10 and 30-32 parts per thousand respectively.

  Water temperatures are consistently low, ranging from -1.8 degrees Celsius in the north to -0.8 degrees in the south-east. There is, however, a warmer middle layer at up to 1.5 degrees, fed by Atlantic waters that take 2.5-3 years to travel from their formation point near Spitsbergen to reach the Laptev Sea.

• 4. Peoples of the Shore

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  Yukaghirs and their sub-group the Chuvans were the first peoples recorded living on the Laptev Sea coast, sustained by fishing, hunting, and reindeer husbandry. Reindeer sleds were not a cultural detail but a practical necessity for transportation and hunting across the tundra and ice.

  Around the 2nd century, the Evens and Evenks joined and gradually absorbed the Yukaghirs. Then, between the 9th and 15th centuries, the much more numerous Yakuts arrived. All of these groups had migrated north from the Lake Baikal region, moving away from confrontations with the Mongols. Despite sharing that broad migratory path, they spoke different languages and practiced different customs, though shamanism was common across all the groups.

  Russians arrived in the 17th century, typically travelling south to north along the major rivers that empty into the sea. In 1629, Siberian Cossacks navigated the Lena River all the way to its delta and left a written note recording that the river flows into a sea. A second group reached the delta of the Olenyok River in 1633. Many earlier explorations almost certainly went unreported; archaeologists later found graves on some islands that had supposedly been discovered for the first time by official expeditions, pointing to unrecorded visits long before.

  By the 1770s, a merchant named Ivan Lyakhov was visiting the island groups in the eastern sea and petitioning the government for rights to harvest their ivory. Catherine II granted him permission and named the islands after him. Lyakhov described other islands in the area during that decade, including one he named Kotelny, after a large iron kettle left there by earlier, unnamed visitors. He also established the first permanent settlements on the islands.

• 5. Explorers and Expeditions

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  Vasili Pronchishchev set out from Yakutsk in 1735 aboard a vessel called the Yakutsk, sailing down the Lena River to survey the eastern coast of its delta. His crew wintered at the mouth of the Olenyok River, where many men fell ill and died of scurvy. Pressing on despite the losses, Pronchishchev reached the eastern shore of the Taymyr Peninsula in 1736 and went north to map its coastline before scurvy claimed him and his wife on the return journey. Maria Pronchishcheva Bay in the Laptev Sea carries her name today.

  During the Great Northern Expedition of 1739-1742, Russian Arctic explorer and Vice Admiral Dmitry Laptev charted the sea coastline from the Lena delta along the Buor-Khaya and Yana gulfs to the strait that now bears his name. His cousin Khariton Laptev led a separate party surveying the coast of the Taimyr Peninsula from the Khatanga River outward, as part of the same expedition.

  Pyotr Anjou, working between 1821 and 1823, traveled some 14,000 kilometres across the region using sledges and small boats. He was searching for a landmass called Sannikov Land and in doing so demonstrated that large-scale coastal mapping could be conducted without ships. The Anzhu Islands, the northern part of the New Siberian Islands, were named after him.

  Adolf Erik Nordenskiöld was the first person to cross the entire sea by ship, doing so in 1875 aboard the steamship Vega. Baron Eduard von Toll conducted two separate expeditions to the area, in 1892-1894 and again in 1900-1902, carrying out geological and geographical surveys for the Russian Imperial Academy of Sciences on a ship called the Zarya. During his second expedition, Toll disappeared near the New Siberian Islands under circumstances that were never explained. He had earlier identified large accumulations of fossil ivory in river terraces and beaches within the islands; later scientific work established that this ivory had accumulated over roughly 200,000 years.

• 6. Naming the Sea

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  The sea circulating north of Siberia has carried at least five different names in European records. In the 16th century it was called the Tartar Sea. In the 17th century it became the Lena Sea. The 18th century brought the name Siberian Sea, and the 19th century favoured the Icy Sea. In 1893 it was renamed the Nordenskjold Sea in honour of the Swedish-Finnish explorer who had crossed it by steamship.

  On the 27th of June 1935, the Soviet government assigned the name it carries today, in recognition of the cousins Dmitry Laptev and Khariton Laptev, who had first systematically mapped its shores between 1735 and 1740. The name was formalized decades after the expeditions it honours, closing a loop that began when Dmitry charted the coastline from the Lena delta to the strait that now carries his own name.

• 7. Gulag, Ice Routes, and Oil

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  Coal, oil, and salt deposits were found around Nordvik Bay in 1930, drawing Soviet attention to one of the most remote corners of the Laptev coast. To exploit them, the Soviet state established a Gulag penal labor camp at Nordvik. The oil deposits turned out to be small and shallow, bound up with salt structures, and commercially negligible. The salt, however, was another matter: extracted by forced laborers, Nordvik became a significant supplier of salt to the northern fisheries from the 1930s onward. The experience gained drilling through continuous permafrost at Nordvik later proved useful in the larger oil and gas explorations of Western Siberia. The penal colony was shut down and its traces erased in the mid-1940s, just before American allies arrived in Nordvik.

  Navigation along the Laptev Sea was shaped heavily by Soviet-era investment in icebreaker fleets and the Northern Sea Route. Even icebreakers were not guaranteed safe passage: the ship Lenin and a convoy of five vessels were trapped in ice in the Laptev Sea around September 1937 and spent an enforced winter there before the icebreaker Krasin freed them in August 1938. Timber, fur, and construction materials were the main cargo moving through the sea during the Soviet period.

  After the Soviet Union dissolved, commercial shipping through the Siberian Arctic declined sharply in the 1990s. The port town of Logashkino was abandoned in 1998 and is now a ghost town. In 2017, the state oil company Rosneft found oil at a well called Tsentralno-Olginskaya-1 in the Laptev Sea, the first confirmed offshore find in these waters.

• 8. Life at the Edge

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  Plant life in the Laptev Sea is sparse by design: the harsh climate simply does not permit abundance. More than 100 species of diatoms form the backbone of marine vegetation. Green algae, blue-green algae, and flagellate species number around 10 each. The total phytoplankton concentration runs at about 0.2 milligrams per litre, characteristic of brackish water. Zooplankton counts reach about 0.467 milligrams per litre across 30 known species.

  On land, mosses and lichens dominate the coastal flora. Flowering plants include the Arctic poppy, Saxifraga, and Draba, alongside small populations of polar and creeping willows. Fish diversity is limited to 39 species, most suited to brackish conditions. Grayling and whitefishes dominate, among them muksun, broad whitefish, and omul. Sardine, Arctic cisco, and polar cod are also common.

  The sea supports a broader community of mammals. Ringed seals, bearded seals, harp seals, walruses, and polar bears are year-round residents. The Laptev walrus is sometimes classified as a distinct subspecies, Odobenus rosmarus laptevi, though that attribution remains debated. Beluga whales visit seasonally. Arctic foxes, wolves, ermines, reindeer, and lemmings populate the shore.

  In 1985, the Ust-Lena Nature Reserve was established in the delta of the Lena River, covering 14,300 square kilometres. The New Siberian Islands were added to the reserve the following year. The reserve now hosts 402 plant species, 32 fish species, 109 bird species, and 33 mammal species, making it one of the most carefully documented corners of this otherwise little-visited sea.