We have the following intergovernmental agreements in Australia:
Links
[1] https://www.amsa.gov.au/about/who-we-work/intergovernmental-agreement-national-plan-combat-pollution-sea-oil-and-other
[2] https://www.amsa.gov.au/about/who-we-work/intergovernmental-agreements-australia-and-other-governments/intergovernmental
[3] https://www.amsa.gov.au/inter-governmental-agreement