Jeddah is a city in the Tihamah region of the Hejaz on the coast of the Red Sea and is the major urban center of western Saudi Arabia. It is the largest city in Makkah Province, the largest seaport on the Red Sea, and with a population of about four million people (as of 2017), the second-largest city in Saudi Arabia after the capital city, Riyadh. Jeddah is Saudi Arabia’s commercial capital. Jeddah is the principal gateway to Mecca and Medina, two of the holiest cities in Islam and popular tourist attractions.