The Kuparuk River Oil Field, or Kuparuk, located in North Slope Borough, Alaska, United States, is the second largest oil field in North America by area. It produces approximately 230,000 barrels per day (~1.1×10 t/a) of oil and is estimated to have 2 billion barrels (320×10 6 m3) of recoverable oil reserves.[1] It is named for the Kuparuk River.