Mitchells Island is the largest of several islands in the mouth of the Manning River. It is roughly triangular in shape and has an area of approximately 130 km2 (50 sq mi). It is bordered on the north by the main channel of the Manning River, on the southwest by Scotts Creek, and on the east by the Pacific Ocean. The ocean edge extends from Old Bar in the south to Harrington to the north. Mitchells Island largely consists of dense rainforest, home to many native animals including koalas, echidnas, wallabies, possums, bandicoots, quolls, goannas and birds.