Costa References Costa region, Ecuador Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: Ecuador/ Relief…three main physical regions: the Costa (coastal region), the Sierra (highland region), and the Oriente (eastern region). Read More…three main physical regions: the Costa (coastal region), the Sierra (highland region), and the Oriente (eastern region). Read More