Final answer:
The Peloponnesus is located in southwestern Greece and was the site of many ancient Greek city-states.
Step-by-step explanation:
The Peloponnesus was located in southwestern Greece. It is a large peninsula that is connected to the mainland by the narrow Isthmus of Corinth. The Peloponnesus is known for its historical significance as it was the site of many important ancient Greek city-states, such as Sparta and Corinth.