Final answer:
The Andes Mountains located along the eastern coast of South America, the Amazon River as the longest river in South America, Ecuador and Peru as the two countries with highlands, and the Galapagos Islands as an archipelago off the coast of South America.
Step-by-step explanation:
The mountain range located along the eastern coast of South America is the Andes Mountains.
The longest river in South America is the Amazon River.
The two countries in South America where you can find highlands are Ecuador and Peru.
One of the archipelagos off the coast of South America is the Galapagos Islands.
Learn more about South America geography