The Andes People are an indigenous group of people who have lived in the Andes Mountains for centuries. The most well-known of these people are the INCA, which is a four letter word, and the Incas, which is a five letter word. The INCA Empire was the largest empire in pre-Columbian America and was centered in what is now Peru. The Incas were known for their advanced engineering, architecture, and agricultural techniques. They also had a complex system of government and religion.