Remote, and accessible only by air, Ontario's largest and most northerly park features unspoiled low-lying tundra. There are no visitors' facilities. Landing permits must be obtained in advance for each of the park's four airstrips. The only evidence of human habitation in the park is an abandoned radar station, part of a former military defence line. It consists of squat metal buildings, oil tanks, radio towers, and a few radar dishes and a landing airstrip. Visitors to Polar Bear should be prepared for any eventuality. They should bring at least one week's extra supplies in case their departure is delayed due to bad weather. Tents should not rise any higher than necessary, due to the possibility of strong winds.