Hidden in the Arctic, the world's largest island lake remains a frozen mystery

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Spanning over 5,500 square kilometers on Baffin Island, Nettilling Lake holds the title of the world's largest lake situated on an island. Despite its massive scale and location directly across the Arctic Circle, this cold, remote freshwater expanse remains largely inaccessible, frozen for the majority of the calendar year.

Located in the Qikiqtaaluk Region of Nunavut, Canada, Nettilling Lake is a geographical giant. It ranks as the 27th largest lake globally by surface area and stands as the largest lake within the borders of Nunavut. Its dimensions are impressive, stretching to a maximum length of 123 kilometers. The lake sits within the Great Plain of the Koukdjuak, approximately 280 kilometers northwest of Iqaluit, and is uniquely bisected by the Arctic Circle.

The lake's hydrology is defined by its connection to the surrounding landscape. It is primarily fed by Amadjuak Lake—the second largest on Baffin Island—alongside various streams and smaller water bodies. Water eventually drains westward through the shallow Koukdjuak River into the Foxe Basin. The lake itself is divided into two distinct topographies: the eastern half is characterized by a dense scattering of small islands, while the western half is deeper and entirely devoid of islands.

The environment surrounding Nettilling Lake is a critical habitat for Arctic wildlife. The name itself, derived from the Inuktitut word for the adult ringed seal, reflects the presence of these animals within the lake's cold waters. Beyond seals, the lake supports three specific fish species: the Arctic char, the ninespine, and the three-spined stickleback. The surrounding tundra serves as a vital region for the feeding and calving of barren-ground caribou, highlighting the lake's role as a cornerstone of the local ecosystem.

Scientific interest in the region dates back to the late 19th century, notably when Franz Boas explored the southern shore in 1884. Today, the lake remains a testament to the vast, untamed nature of the Canadian Arctic. While it holds significant rankings—being the eleventh largest lake in Canada and the seventh largest entirely within the country—its harsh climate and remote location ensure it remains a place of quiet, frozen isolation.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• A massive Arctic lake that only emerged from the sea 4,500 years ago
• Melville Island: An Uninhabited Arctic Giant Divided by a Meridian
• The remote Arctic islands that hold 14 percent of the world's glacial ice
• Lake Athabasca is a massive, ancient remnant of a prehistoric glacial sea in Canada.
• Canada’s largest wholly domestic lake hides uranium shores
• How a social democratic party transformed Manitoba politics through decades of shifting electoral fortunes
• How a Lancashire mill town became a global pioneer in football and political radicalism
• New England English is not one dialect, but a complex map of four distinct varieties
• The short-lived Florida fort that became a sanctuary for hundreds of escaped slaves
• From a small Manitoba workshop to the forefront of North American transit bus innovation
• The Neckar River is a 362-kilometre industrial artery carving through Germany's ancient limestone landscapes.
• The New Guinea crocodile is actually two distinct species separated by a mountain range.

More in Bodies of water · More in Countries & Cities · Latest · A–Z · All topics