Treasury Islands (7°23′15″S 155°33′30″E / 7.38750°S 155.55833°E) are a small group of islands a few kilometres to the south of Bougainville and 24 kilometres (15 miles) from the Shortland Islands. They form part of the Western Province of the country of Solomon Islands. The two largest islands in the Treasuries are Mono Island and the smaller Stirling Island. The deep water strait between these two islands is called Blanche Harbour.[1][2]