Machias Seal Island, Disputed territory in the Gulf of Maine, United States and Canada.
Machias Seal Island is a disputed territory in the Gulf of Maine spanning around 18 acres between Maine and New Brunswick. A lighthouse maintained by the Canadian Coast Guard since 1832 sits on the rocky landscape and serves as a navigational marker for ships in the region.
The territorial dispute dates to the 1782 Treaty of Peace, which contained ambiguous language regarding island ownership in the Gulf of Maine. This created a long-standing deadlock between the United States and Canada over control of the location.
The island serves as a protected bird sanctuary where Atlantic puffins and other seabirds live and breed under strict environmental protections. Visitors can observe these colonies and understand how the site has become central to regional conservation efforts.
The island can only be visited through authorized tour operators, with a daily limit of 30 people during the seabird breeding season. Visitors should prepare for rough weather conditions and wear appropriate clothing for the windy and damp coastal environment.
The waters surrounding the island form a gray zone where both American and Canadian fishermen operate without clear jurisdictional boundaries. This legal ambiguity has led to an unwritten tolerance practiced by local fishing communities.
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