Final answer:
Jeddah and Jubail are maritime trade hubs in Saudi Arabia, serving as important centers for international trade and shipping.
Step-by-step explanation:
Jeddah and Jubail are best described as maritime trade hubs. These cities in Saudi Arabia have strategic coastal locations that make them important centers for international trade and shipping. Jeddah is located on the Red Sea and serves as the main port for the country, while Jubail is situated on the Arabian Gulf and is known for its industrial and commercial activities.