Falklands: Argentina's New Legal Dispute Over the Sea Lion Oil Project

The longstanding Argentina-United Kingdom Falkland Islands dispute is back in the global headlines. The UK endorsement of the offshore “Sea Lion” project in waters to the north of the islands has seen Argentina respond by commencing a legal challenge.

The Sea Lion hydrocarbon exploitation licences have been granted to Navitas Petroleum operating in conjunction with Rockhopper Exploration in an area located approximately 107 nautical miles to the north of the islands, covering 541km2.

Argentina’s legal challenge is under the 1982 United Nations Convention on the Law of the Sea (UNCLOS) and is two pronged via an initial request for provisional measures before the Hamburg-based International Tribunal for the Law of the Sea (ITLOS), with a final determination by an Arbitral Tribunal to follow. ITLOS hearings are scheduled for 10–11 November 2026 and a decision on that phase of the case can be expected soon after.

While Argentina has framed its claim around UNCLOS, the core of the case is the territorial dispute over the islands, referred to as Malvinas by Argentina. This longstanding dispute has its roots in European settlement throughout parts of South America, a British outpost being established and then abandoned in the 18th century, followed by a more permanent British presence on East Falkland and West Falkland from the 19th century until today. The islands have an approximate population of 3,500 and formally are a “British Overseas Territory” (BOT) along with other such territories including Bermuda and Gibraltar.

This story was originally published by The Maritime Executive. Read the full story at The Maritime Executive →