District of Ungava significant event Quebec Boundaries Extension Act, 1912
At the time of its creation, Ungava covered over one million square kilometres (390,000 sq mi), although just under 15% of its area was also claimed by Newfoundland. However, just three years later with the adoption of the Quebec Boundary Extension Act, 1898, the southernmost portion of the District of Ungava (excluding offshore islands) was transferred by the Parliament of Canada to Quebec. All told, the act transferred approximately 250,000 square kilometres (97,000 sq mi) of Ungava to Quebec, the majority of which now lies in the modern-day Jamésie region of the province. After the transfer was complete, the mainland area of the District of Ungava reached no further south than the mouth of the Eastmain River—about halfway down James Bay, as shown on the accompanying map.
With the Quebec Boundaries Extension Act, 1912, all of Ungava's remaining continental land was transferred to Quebec. The almost entirely uninhabited offshore islands of Ungava (over 1,500 of them) were not officially transferred to the District of Keewatin in the Northwest Territories until 1920, at which point the District of Ungava (which had not functioned in any administrative capacity for eight years) formally ceased to exist.
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