The term 'ANDES TUBER' is composed of two crossword solutions: OCA (3 letters) and ANDES (6 letters). OCA is a root vegetable native to the ANDES Mountains in South America. It is also known as the Peruvian ground apple, and is an important food source for many people in the region. The tuber is high in carbohydrates and is used to make a variety of dishes. The ANDES Mountains are a mountain range located in western South America, stretching from Venezuela to Chile. They are the longest continental mountain range in the world and are home to a variety of flora and fauna.