 On 28 October 2016, the CCAMLR, composed of 24 member countries and the European Union at the time, agreed to establish the world's largest marine park encompassing 1.55 million km2 (600,000 sq mi) in the Ross Sea after several years of failed negotiations.Establishment of the Ross Sea MPA required unanimity of the commission members and enforcement will begin in December 2017.However, due to a sunset provision inserted into the proposal, the new marine park will only be in force for 35 years.