Eufaula Lake is a reservoir in Oklahoma. It is located on the Canadian River, 27 mi (43 km) upstream from its confluence with the Arkansas River and near the town of Eufaula. The lake covers parts of McIntosh County, Pittsburg, Haskell and Okmulgee counties and drains 47,522 square miles (123,080 km²). Water sources include the Canadian, North Fork Canadian and Deep Fork rivers.