A nearly perfect circular lake in a 1.4-million-year-old impact crater. The water is among the purest on Earth, with visibility exceeding 35 meters. Inuit call it the Crystal Eye of Nunavik, a sacred site.
NASA. Courtesy of Denis Sarrazin., Public domain
An impact in the Pleistocene
Approximately 1.4 million years ago, a chondrite meteorite struck the Earth's crust, creating the Pingualuit Crater. The impact released energy estimated to be 8,500 times more powerful than the atomic bomb at Hiroshima. The resulting structure is an almost perfectly circular simple crater with a diameter of 3.44 kilometers. Its raised rim rises 160 meters above the surrounding tundra, and the crater itself is 400 meters deep.
Over millennia, the crater filled with rain and snowmelt, forming Pingualuk Lake. The lake has no inlets or outlets, creating a closed system where water is lost only to evaporation. This isolation is the reason for its exceptional purity. The water has a salinity level of less than 3 parts per million, dramatically lower than the 500 ppm found in the Great Lakes. This purity results in extreme clarity, with a Secchi disk—a tool for measuring water transparency—visible to depths of more than 35 meters. The lake itself is 267 meters deep, making it one of the deepest in North America.
A climate change time machine
The crater's geology and the lake's isolated nature make it an invaluable site for scientific research. Because the deep lake and its protective rim shielded the bottom sediments from glacial scouring during past ice ages, these layers remain remarkably undisturbed. This provides a continuous and well-preserved natural archive of environmental history.
In 2007, a scientific expedition led by Professor Reinhard Pienitz of Laval University drilled into the lakebed to extract sediment cores. A nine-meter core was retrieved, containing fossilized pollen, algae, and insect larvae. Analysis of these samples shows climate conditions dating back at least 120,000 years, covering two previous interglacial periods. These preserved sediments allow scientists to reconstruct past climate patterns with a level of detail unavailable in most other North American lakes.
The only fish species in the lake is the Arctic char. Scientists believe these fish have been living in isolation for thousands of years, showing genetic evolution and adaptation in freshwater ecosystems.
💡Fun Facts
The name Pingualuit means "where the land rises" or "pimple" in the local Inuktitut language, referring to the crater's raised rim.
Before being named Pingualuit in 1999, it was known to Western science as the "Chubb Crater" and later the "New Quebec Crater".
It was first identified from a photograph taken by a U.S. Army Air Force plane on a meteorological flight in 1943.
The impactor was a chondritic meteorite, a type of stony meteorite, identified from enrichments of iron, nickel, and cobalt in impact melt rocks found nearby.
The park is open year-round, but access is seasonal and typically requires booking a package with Inuit guides. The best time to visit for hiking is from June to September.
Admission
Access is not by individual admission but through all-inclusive guided packages, which can range from several hundred to several thousand dollars.
Accessibility
The park is located in a remote arctic tundra environment with no roads. Access is via chartered aircraft from the village of Kangiqsujuaq. The terrain is rugged and not wheelchair accessible.
