1. The Arctic division, containing 125,245 square miles, and comprising all that portion of the North American continent between the one hundred and forty-first meridian in the east and Cape Prince of Wales, or Behring Strait, in the west, the Arctic Ocean in the north, and having for its southern boundary a line indicating the watershed between the Yukon River system and the streams emptying into the Arctic and impinging upon the coast of Behring Sea just north of Port Clarence.
2. The Yukon division, containing 176,715 square miles, and comprising the valley of the Yukon River as far as it lies within our boundaries and its tributaries from the north and south. This division is bounded by the Arctic division in the north, the one hundred forty-first meridian in the east, and Behring Sea in the west. The southern boundary lies along a line indicating the watershed between the Yukon and the Kuskokvim, Sushetno, and Copper Rivers, and runs from the above-mentioned meridian in the east to the coast of Behring Sea, in the vicinity of Hazen Bay, in the west. The island of St. Lawrence, in Behring Sea, is included in this division.
3. The Kuskokvim division, containing 114,975 square miles, bounded on the north by the Yukon division, and comprising the valleys of the Kuskokvim, the Togiak, and the Nushegak Rivers, and the intervening system of lakes. The eastern boundary of this division is a line running along the main Alaskan range of mountains from the divide between the Kuskokvim and Tennanah Rivers down to the low, narrow isthmus dividing Moller Bay from Zakharof Bay, on the Alaska peninsula. Behring Sea washes the whole west and south coasts of this division, which also includes Nunivak Island.
4. The Aleutian division, containing 14,610 square miles, and comprising the Alaska peninsula westward of the isthmus between Moller and Zakharof Bays and the whole chain of islands from the Shumagin group in the east to Attoo in the west, including also the Pribylof or fur-seal islands.
5. The Kadiak division, containing 70,884 square miles, and comprising the south coast of the Aliaska peninsula down to Zakharof Bay, with the adjacent islands, the Kadiak group of islands, the islands and coasts of Cook's Inlet, the Kenai peninsula, and Prince William Sound, with the rivers running into them. The main Alaskan range bounds this division in the north and west. Its eastern limit is the one hundred and forty-first meridian, which intersects the coast-line in the vicinity of Mount St. Elias, while the south shores of the division are washed by that section of the North Pacific named the Gulf of Alaska.