After Ennis leaves Alma, he continues meeting with Jack Twist.

"Years on years they worked their way through the high meadows and mountain drainages, horse-packing into Big Horns, Medicine Bows, Gallatins, Absarokas, Granites, Owl Creeks, the Bridger-Teton Range, the Freezeouts and the Shirleys, Ferrises and the Rattlesnakes, Salt River Range, into the Wild Rivers, the Sierra Madres, Gros Ventres, the Washakies, Laramies, but never returning to Brokeback."

"One thing never changed: the brilliant charge of their infrequent couplings was darkened by the sense of time flying, never enought time, never enough."

This is also the portion of the novel where Ennis and Jack get into an argument after Ennis refuses to run away with Jack and live together. It is not clear exactly where they are amidst the many locations listed that they visited.