Lower Montana River is a river in Red Dead Redemption and Red Dead Redemption 2. The river acts as the border between the New Austin and West Elizabeth territories.
The river begins with the Aurora Basin in the Tall Trees region of the West Elizabeth territory. It then flows southward between West Elizabeth and New Austin, north of MacFarlane's Ranch. The river flows into Flat Iron Lake between Thieves Landing and Quaker's Cove.
The Lower Montana River is possibly based on the Pecos River, given its proximity to the San Luis River (which is based on the Rio Grande), and its rough geographic correspondence (western Texas).