The Alaska Boundary Line Agreement refers to a historic agreement between the United States and Canada that determined the precise boundary line between the Alaska Territory of the United States and the Canadian provinces of British Columbia and Yukon. This agreement aimed to resolve a longstanding dispute over the exact border between these regions. The Alaska Boundary Line Agreement was signed on October 20, 1903, and remains a significant diplomatic milestone in the history of both countries. The agreement was mediated by a tribunal of three British jurists appointed by the British government, known as the Alaska Boundary Tribunal. The tribunal was tasked with interpreting an earlier treaty between Russia and Great Britain that defined the boundary between Alaska and British Columbia. The agreement establishes the boundary line from the Dixon Entrance, along the crest of certain mountain ranges, to the northernmost point of Portland Channel. From there, it continues along the main channel of Portland Canal to the 56th parallel of latitude, then follows that parallel eastward until it meets the mountain range separating Alaska from the Yukon. The boundary then follows the crest of these mountains to the 141st meridian of west longitude, where it meets the Arctic Ocean. The Alaska Boundary Line Agreement resulted in the determination of a single boundary line, resolving the dispute and setting a definitive border between Alaska and Canada's British Columbia and Yukon territories. It provided clarity for both countries' territorial claims and facilitated peaceful relations and cooperation in the region. It is important to note that there are no different types of Alaska Boundary Line Agreements. However, there have been subsequent agreements and treaties between the United States and Canada related to other boundary disputes and management of shared natural resources in the region, such as the Alaska-Canada border dispute over the Beaufort Sea and the management of transboundary water resources.