text: Machias Seal Island is disputed territory between Canada and the United States.
  
  Treaty between the two countries defines the border to between Grand Manan, NB, and the Maine shore, to the southern end of Grand Manan. To the southwest there is no treaty-based boundary; however, a 1982 International Court at the Hague determined that the international boundary begins again about 10 seconds to the southwest of Machias Seal Island, and seaward, dividing the Gulf of Maine between the two countries. That boundary is referred to as the Hague Line.
  
  The area between the south end of Grand Manan and the north end of the Hague Line (roughly 100 square miles surrounding Machias Seal Island) remains disputed, and is referred to as the "Grey Zone". Both Maine and New Brunswick fishermen fish the Grey Zone. Both governments manage the bird wildlife on Machias Seal Island, with puffin watch boats from both countries landing there. There is a Canadian-built and staffed lighthouse there, since the island presents a hazard to navigation.