Final answer:
Delaware is the state with the Atlantic Ocean, Delaware Bay, Indian River Bay, Rehoboth Bay, Fenwick Island, and Little Assawoman Bay, and is located in the Mid-Atlantic region.
Step-by-step explanation:
The state that has the Atlantic Ocean, Delaware Bay, Indian River Bay, Rehoboth Bay, Fenwick Island, and Little Assawoman Bay is Delaware. This state is situated in the Mid-Atlantic region of the United States. The Delaware Bay is a notable estuary and is bordered by Delaware and New Jersey. Efforts have been made to clean and restore these important bodies of water, necessitating cooperation across state lines. Fenwick Island and Little Assawoman Bay are both located in the southern part of Delaware, contributing to its unique coastal geography.