The Kingdom of Saudi Arabia is located in Southwest Asia occupying most of the Arabian Peninsula. It has a population of 26.8 million people and its economy relies heavily on oil exports, though it is trying to diversify. Major projects are underway to expand religious tourism to the holy cities of Mecca and Medina, with over $100 billion being invested in real estate and infrastructure projects. The construction industry is one of the largest sectors of the economy and the government is also investing heavily in other infrastructure like airports and rail systems.