The Timor Gap Treaty was formally known as the Treaty between Australia and the Republic of Indonesia on the zone of cooperation in an area between the Indonesian province of East Timor and Northern Australia. It was a bilateral treaty between the governments of Australia and Indonesia, which provided for the joint exploitation of petroleum and hydrocarbon resources in a part of the Timor Sea Seabed. The treaty was signed on 11 December 1989 and came into force on 9 February 1991. The signatories to the treaty were then Australian Foreign Affairs Minister Gareth Evans and then Indonesian Foreign Minister Ali Alatas.