The Arabian Peninsula's coastline and water resources played a crucial role in the development of trade and commerce in the region. The Red Sea and the Persian Gulf provided easy access to other parts of the world, allowing for trade and exchange of goods and ideas. The availability of water also allowed for the development of settlements and agriculture, which in turn led to the growth of commerce and trade. The Arabian Peninsula became a hub for trade and commerce, with merchants from all over the world coming to exchange goods and ideas in the region.