Portsmouth Harbor is a natural harbor located in the city of Portsmouth, New Hampshire. It serves as an important port for both commercial and recreational activities. The harbor is characterized by its deep waters and sheltered bays, making it a safe haven for boats and ships. It is also home to several historic sites, including the USS Albacore, a retired submarine that is now a museum. The harbor is fed by the Piscataqua River, which flows into the Atlantic Ocean. This strategic location has made Portsmouth Harbor a vital shipping route since colonial times. Today, it continues to support local fishing industries and tourism, attracting visitors with its scenic views and maritime history.