Maritime Borders: The Territorial Water Disputes Between Ireland and the UK
The demarcation of maritime boundaries between the United Kingdom and Ireland is a complex legal and political issue rooted in the early 20th century. While modern treaties have settled many aspects of their Exclusive Economic Zones (EEZs)—the sea zones over which a state has special rights regarding the exploration and use of marine resources—certain territorial waters remain a point of contention.
The tension primarily centers on whether the administrative boundaries of counties, as defined in historical legislation, extend into the sea or stop at the low water mark.
Key Facts
- A 1988 treaty defines the EEZ boundary across the continental shelf from the south Irish Sea to the Celtic Sea.
- The 2014 agreement further clarified the boundary between the respective EEZs of Ireland and the UK.
- The Government of Ireland Act 1920 is the central piece of legislation cited in disputes over territorial waters.
- Lough Foyle and Carlingford Lough remain politically disputed maritime areas.
- The Loughs Agency currently manages activities in these waters as a cross-border body.
The Legal Origins of the Dispute
The controversy began with the Government of Ireland Act 1920. While the Act defined the territories of Northern Ireland and Southern Ireland by their parliamentary counties, it did not explicitly address territorial waters (the belt of coastal waters extending from the baseline of a coast). Section 11(4) of the Act only limited the competence of both regions regarding lighthouses, buoys, and beacons.
As the Irish Free State emerged as a self-governing dominion, the status of these waters became critical. In November 1922, James Craig, the Prime Minister of Northern Ireland, sought clarification from the British House of Commons. He questioned whether the six parliamentary counties of Northern Ireland included the ordinary territorial waters extending three miles from the shore.
At the time, the Attorney General, Sir Douglas Hogg, provided a legal opinion stating that the territorial waters did indeed accompany the counties.
The Irish Counter-Argument
This interpretation was later challenged by the Irish government. In 1972, Taoiseach Jack Lynch argued that under English law, counties do not include adjacent territorial waters. Consequently, the Irish position was that the territorial waters around the entire island of Ireland remained with the Irish Free State, as the 1920 Act only transferred the land-based counties and boroughs to Northern Ireland.
Case Study: Lough Foyle and Carlingford Lough
The dispute is most evident in Lough Foyle, situated between County Londonderry (Northern Ireland) and County Donegal (Ireland). In 1923, a court in the Free State ruled that its territorial waters extended to the shore of County Londonderry.
By 1927, illegal fishing led to a diplomatic clash. James Craig proposed giving the Royal Ulster Constabulary powers to search vessels in the Lough, a move W. T. Cosgrave, the Free State leader, warned would create a "very serious situation," asserting that the entire Lough was Free State territory.
Administrative Solutions Over Sovereignty
To manage the practical issues of fishing and jurisdiction without resolving the underlying question of sovereignty, several bodies were established:
- Foyle Fisheries Commission (1952): Created under joint authority to manage fishing rights.
- Foyle, Carlingford and Irish Lights Commission: Established following the Good Friday Agreement under the North/South Ministerial Council.
- Loughs Agency: A cross-border body established by the 1998 Belfast Agreement to regulate activities in the Loughs.
Despite these arrangements, the UK maintains that the whole of Lough Foyle is within UK territory, while the Irish government maintains that no formal agreement on the delimitation of the boundary has ever been reached.
Summary of Maritime Agreements and Disputes
| Area | Status | Governing Agreement/Body |
|---|---|---|
| Continental Shelf / EEZ | Resolved | 1988 Treaty / 2014 Agreement |
| Lough Foyle | Disputed | Loughs Agency (Management only) |
| Carlingford Lough | Disputed | Loughs Agency (Management only) |
| General Territorial Waters | Practically Resolved | EU Common Fisheries Policy |
Frequently Asked Questions
What is the current status of the maritime border between Ireland and the UK?
While the Exclusive Economic Zones (EEZs) were agreed upon in 2014 and the 1988 treaty demarcates the continental shelf, the precise territorial boundaries of Lough Foyle and Carlingford Lough remain disputed in principle.
Why is the Government of Ireland Act 1920 significant to this dispute?
The Act defined the territories of Northern and Southern Ireland by parliamentary counties but did not explicitly state whether those counties included the surrounding territorial waters, leading to conflicting legal interpretations.
How is fishing managed in disputed waters like Lough Foyle?
Management is handled by cross-border bodies, specifically the Loughs Agency, which was established under the 1998 Belfast Agreement to cooperate on the management of the loughs without deciding the issue of sovereignty.
What is the UK's official position on Lough Foyle?
The UK government's position, as underlined by the Foreign and Commonwealth Office in 2009, is that the entirety of Lough Foyle is within the United Kingdom.
What is the Irish government's position on the territorial boundary?
The Irish government asserts that there has never been a formal agreement on the delimitation of the territorial water boundary and has historically claimed that the waters around the island belong to the Irish state.