Bribie Island is the smallest and most northerly of three major sand islands forming the coastline sheltering the northern part of Moreton Bay. Bribie Island is 34 kilometres long, and 8 kilometres at its widest.

Most of the island is uninhabited national park and forestry plantations. The southern end of the island has been intensively urbanised as part of the Moreton Bay Region, the main suburbs being Bongaree, Woorim, Bellara and Banksia Beach.