The Red Sea and Persian Gulf were essential trade routes that connected Arabia to other civilizations. The sea trade allowed for the exchange of goods, such as spices, incense, pearls, and textiles, which contributed to the wealth and prosperity of the region. The coastal cities, such as Jeddah, Aden, and Muscat, became thriving centers of trade and commerce. The sea trade also facilitated the spread of Islam and Arabic language to other parts of the world.