The rivers of the bay region are low-gradient with mid-speed flows and very few abrupt elevation changes as they flow from the tundra to the sea. The lakes also serve as prime nursery areas for juvenile fish, as well as overwintering grounds for many native fish species. The lakes of the region serve as filters and flow regulators, making most of the systems flow clear with fairly consistent volumes throughout the summer months. The rivers of Bristol Bay are of mostly lake-origin, with a few glacial-fed systems as well. Bordered by the Kilbuck-Ahklun range to the northwest, the Taylor mountains to the north, and the Aleutian Range to the southeast, the region is home to some of the largest lakes in Alaska, including Lake Iliamna, at over 1,000 square miles of surface area. Located 280 air-miles southwest of Anchorage and accessible only by boat or plane, the Bristol Bay region covers roughly 55,000 miles of varied terrain, mostly soggy tundra. Framed by 8 major river systems, 'The Bay' is home to the world's largest sockeye salmon run, and some of the greatest freshwater fly angling to be found on the planet. Bristol Bay is a large inlet on the remote easternmost shore of the Bering Sea.

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