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-agreement-national-maritime-emergency-response-arrangement
[3] https://natsar.amsa.gov.au/iga.asp