This is an enormous ice cave within a glacier. It was formed by the flow of meltwater deep inside the glacier. This phenomenon is also known as an englacial melt channel.
Devon Island, the 27th largest island on Earth, is over 55,000 square kilometres, comparable in size to Croatia.
This desolate island lies at 77 degrees north. A third of it is covered by an ice cap, and enjoys fewer than two months of snow-free days per year.
In certain areas, Devon is occupied by a few musk-oxen and a few lemmings; however, no human lives there all year round. It is the largest uninhabited island on earth.
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