Bribie Island is the smallest and most northerly of three major sand islands forming the coastline sheltering the northern part of Moreton Bay, Queensland, Australia. The others are Moreton Island and North Stradbroke Island. Bribie Island is 34 kilometres long, and 8 kilometres at its widest. Gympie is a city and a locality in the Gympie Region, Queensland, Australia. In the Wide Bay-Burnett District, Gympie is about 170.7 kilometres north of the state capital, Brisbane. The city lies on the Mary River, which floods Gympie occasionally.