Assateague Island is a barrier island shared by both Maryland and Virginia, famous for its wild horses that roam freely.

Assateague Island is a 37-mile-long barrier island on the Atlantic Coast of the United States. It spans two states: Maryland to the north and Virginia to the south. The wild horses, also known as Chincoteague ponies or Assateague horses, are one of the island's key attractions. The Maryland portion of the island is managed as Assateague Island National Seashore, while the Virginia side includes the Chincoteague National Wildlife Refuge. These wild horses are believed to be descendants of domesticated animals brought to the island centuries ago.