Head of the class in transporting petroleum around the Great Lakes is Enbridge Energy Partners, which owns the 2,211-mile US portion (Lakehead System) of the world's longest liquid petroleum pipeline. When combined with the Canadian segment (owned and operated by Enbridge Inc.), the pipeline system spans some 5,100 miles across North America. Other midstream assets include 5,300 miles of crude oil gathering and transportation lines and 34 million barrels of crude oil storage and terminaling capacity, and 11,100 miles of natural gas gathering and transportation pipelines. Enbridge's US unit Enbridge Energy Management owns a 23% stake in the company.