MPLX transports, stores and distributes crude oil, refined products and other hydrocarbon-based products, primarily in the Midwest and Gulf Coast regions of the U.S. Assets consist of a network of wholly- and jointly-owned common carrier crude oil and refined product pipeline systems and associated storage assets, refined product terminals, storage caverns, refining logistic assets, and an inland marine business.

We own, lease, operate or have interest in approximately 10,000 miles of crude and refined product pipelines. We also own, lease or have interest in 62 light product terminals in the Midwest, Gulf Coast and Southeast regions of the United States. Our terminal facilities are used for the receipt, storage, blending, additization, handling and delivery of refined petroleum products. We have butane and propane storage caverns in Illinois, Michigan and West Virginia.

In addition, MPLX provides fuels distribution services to MPC and owns refining logistic assets consisting of tanks with approximately 56 million barrels as well as refinery docks, loading racks and associated piping.

MPLX's marine operations include 20 owned towboats as and more than 255 owned and leased barges that transport refined products and crude oil on the Ohio, Mississippi and Illinois rivers and their tributaries and inter-coastal waterways. Our marine repair facility is a full-service marine shipyard located on the Ohio River adjacent to MPC's Catlettsburg refinery.

We also have interest in various joint-interests, including LOOP LLC (Louisiana Offshore Oil Port), the only U.S. deep water oil port located offshore in Louisiana, which offloads crude oil from marine vessels destined for onshore storage and pipeline transport.