Uniti Group was formed out of Windstream Communications in 2015 as a REIT and have since merged with Southern Light, Hunt Telecom, PEG Bandwidth, Towercloud, and Inline to create Uniti Fiber. They hold coast-to-coast fiber assets – which all combined is ~1.3m fiber strand miles. Their network map is at https://uniti.com/network?map=fiber and more about Uniti Fiber is at https://www.uniti.com/.