Naknek Lake is a
lake in southern
Alaska, near the base of the
Alaska Peninsula. Located in
Katmai National Park and Preserve, the lake is long and 5–13 km (3–8 miles) wide, the largest lake in the park The lake drains west into
Bristol Bay through the
Naknek River. The elevation of the lake has lowered over the past 5,000 years as it has cut through a glacial
moraine, separating Naknek Lake and Brooks Lake and creating Brooks Falls about 3500 years ago.