Zavanna, LLC is an exploration and production company that operates in the Williston Basin of North Dakota. The company, and ... its predecessors, have been working in the Williston Basin since 1981. Zavanna is a privately held company formed on August 8, 1994. The corporate headquarters is located in Denver, Colorado. Zavanna has marked its growth through the generation of oil and gas prospects for itself and industry partners. In North Dakota, the company has grown from the 100th largest producer in 2007 to the 18th largest in 2017. The Williston Basin of North Dakota is the Company’s core area of interest with the Bakken as its target. read more