Lena Delta

The Lena Delta covers approximately 32,000 square kilometers where the Lena River empties into the Laptev Sea in northern Siberia, making it the largest river delta in the Arctic. It dwarfs other high-latitude deltas and consists of thousands of islands separated by braided channels, forming a vast wetland mosaic that freezes over for much of the year.

The Lena Delta supports significant Arctic biodiversity, including migratory birds like Siberian cranes, swans, and various waterfowl that use the delta as summer breeding grounds. The region is also home to mammals such as reindeer, Arctic foxes, and lemmings across its tundra landscapes, and the surrounding Laptev Sea waters host ringed seals and walruses.

A substantial portion of the Lena Delta is protected within the Ust-Lensky Nature Reserve (Zapovednik), one of Russia's largest strict nature reserves, which safeguards the delta's wetland ecosystems. This protected status helps preserve critical habitat for migratory birds and other Arctic wildlife in one of the most remote regions on Earth.

The Lena Delta sits on continuous permafrost in the Sakha Republic (Yakutia), and rising Arctic temperatures are accelerating permafrost degradation across the region. This thaw not alters the delta's hydrology and land stability but also releases stored methane and carbon dioxide, creating feedback loops that further amplify regional warming.