In December 1978, a treaty was signed by the Australian and Papua New Guinea governments that described the boundaries between the 2 countries and the use of the sea area by both parties.
ɪn dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti ˈeɪt, ɐ tɹˈiːɾi wʌz sˈaɪnd baɪ ðɪ ɔːstɹˈeɪliən ænd pˈæpjuːə nˈuː ɡˈɪni ɡˈʌvɚnmənts ðæt dᵻskɹˈaɪbd ðə bˈaʊndɚɹiz bᵻtwˌiːn ðə tˈuː kˈʌntɹiz ænd ðə jˈuːs ʌvðə sˈiː ˈɛɹiə baɪ bˈoʊθ pˈɑːɹɾiz.