Answer: Iran
Some extra relevant information:
The country in Asia that overlaps with the former Parthian Empire is Iran. The Parthian Empire was a major power in ancient times, encompassing a significant portion of what is now modern-day Iran and parts of neighboring countries. Iran, situated in the Middle East, shares a historical and geographical connection with the Parthian Empire. Today, Iran is known for its rich cultural heritage and historical sites that bear witness to its ancient past as the heartland of the Parthian Empire.