The Abaco Islands lie in the northern Bahamas and comprise the main islands of Great Abaco and Little Abaco, together with the smaller Wood Cay, Elbow Cay, Lubbers Quarters Cay, Green Turtle Cay, Great Guana Cay, Castaway Cay, Man-o-War Cay, Stranger's Cay, Umbrella Cay, Walker's Cay, Little Grand Cay, and Moore's Island. Administratively, the Abaco Islands constitute five of the 31 districts of the Bahamas: North Abaco, Central Abaco, South Abaco, Moore's Island, and Hope Town. Towns in the islands include Marsh Harbour, Hope Town, Treasure Cay, Coopers Town, and Cornishtown.
The combined population of the islands is about 13 000, and the principal settlement and capital is Marsh Harbour. The racial makeup is about 50% white and 50% black.
The Abaco Islands boast important natural areas, especially important coral reef areas, barrier-island terrestrial habitats and large forests of Bahamian Pine (Pinus caribaea var. bahamensis), some of which still contain old-growth trees. As development expands in the Abacos, local groups have begun to more fiercely fight for the preservation of their natural resources, such as in the development case on Great Guana Cay.
Notable species include the Bahamian subspecies of Cuban Amazon (Amazona leucocephala bahamensis), which exists only in Cuba, the Cayman Islands, the southern Bahamas and Abaco. Abaco is also known for its intact elkhorn and staghorn coral structures, and for its critically endangered breed of feral horse, the Abaco Barb.