Lough Foyle, a body of water shared by Ireland and the UK, has become a focal point of dispute due to Brexit. The article outlines the ongoing territorial dispute between the two nations and the additional complications Brexit introduces, particularly regarding fishing quotas and vessel rights. The UK's intention to limit access to its waters to only British ships poses significant challenges for fishermen, especially those from Ireland, as Lough Foyle is a crucial fishing ground. The potential economic impact on Ireland, with a significant portion of its fish catch coming from UK waters, is also discussed. The Department of Agriculture, Food and Marine Affairs in Ireland is considering the Supreme Court's ruling on permitting only Irish offshore fishing vessels, preparing for the possible mass migration of foreign fishermen to Irish waters following potential restrictions in the UK.