ONEOK Partners, L.P. is engaged in gathering, processing, storage and transportation of natural gas in the United States. In addition, the Company owns natural gas liquids (NGL) systems, connecting NGL supply in the Mid-Continent, Permian and Rocky Mountain regions. The Company's segments are Natural Gas Gathering and Processing, Natural Gas Liquids, and Natural Gas Pipelines. The Natural Gas Gathering and Processing segment provides nondiscretionary services to contracted producers in North Dakota, Montana, Wyoming, Kansas and Oklahoma. The Natural Gas Liquids segment owns and operates facilities that gather, fractionate, treat and distribute NGLs and store NGL products, primarily in Oklahoma, Kansas, Texas, New Mexico and the Rocky Mountain region where the Company provides nondiscretionary services. The Natural Gas Pipelines segment provides transportation and storage services to end users through its assets and its ownership in Northern Border Pipeline.