Qatar says it has begun shipping cargo through Oman to bypass restrictions imposed by other Gulf states.
Qatar Ports Management Company said direct services to Sohar and Salalah will operate three times a week.
Cargo for Qatar is usually shipped to ports in the United Arab Emirates and then loaded onto smaller vessels.
But last week the UAE, Saudi Arabia, Bahrain and Egypt severed economic and diplomatic ties with Qatar, alleging it supported terrorist groups and Iran.
Qatar has denied the charges and said the restrictions violate international law.