The proposed Phase IV, Keystone XL (sometimes abbreviated KXL, with XL standing for "export limited") Pipeline, would connect the Phase I-pipeline terminals in Hardisty, Alberta, and Steele City, Nebraska, by a shorter route and a larger-diameter pipe. It would run through Baker, Montana, where American-produced light crude oil from the Williston Basin (Bakken formation) of Montana and North Dakota would be added to the Keystone's throughput of synthetic crude oil (syncrude) and diluted bitumen (dilbit) from the oil sands of Canada.