Long Island is a member of the Whitsunday Island group off the east coast of Queensland, Australia. It is 9 kilometres in length and is at its widest point only 400 metres. Long Island is the closest island in the Whitsunday group to the mainland of Australia, being only 1 kilometre from the coastline. A boat transfer to the island from Shute Harbour on the ma…Long Island is a member of the Whitsunday Island group off the east coast of Queensland, Australia. It is 9 kilometres in length and is at its widest point only 400 metres. Long Island is the closest island in the Whitsunday group to the mainland of Australia, being only 1 kilometre from the coastline. A boat transfer to the island from Shute Harbour on the mainland takes 20 minutes.