The Purgatoire River is a tributary of the Arkansas River located in southeastern Colorado. It flows approximately 125 miles through the Purgatoire Valley, originating in the Sangre de Cristo Mountains and eventually joining the Arkansas River near the town of Las Animas. The river is known for its scenic landscapes and recreational opportunities, including fishing and kayaking. Historically, the Purgatoire River was significant for early settlers and Native American tribes in the region. The river's name is derived from the Spanish word for "purgatory," reflecting its challenging terrain and the hardships faced by those traveling through the area. Today, it remains an important natural resource for local communities.