The Williston Basin is a large geological formation located in the north-central United States and parts of Canada. It spans areas in states like North Dakota, South Dakota, and Montana, as well as the province of Saskatchewan. The basin is known for its rich deposits of oil and natural gas, making it a significant area for energy production. This region was formed during the late Paleozoic and early Mesozoic eras, resulting in various sedimentary rock layers. The Bakken Formation, a key part of the Williston Basin, has gained attention for its shale oil reserves, contributing to the energy boom in the area over the past decade.