Syria is a mountainous country in western Asia bordering Turkey, Iraq and the Mediterranean Sea. For many years it has been involved in conflict, invasion, occupation and other disputes. Most notable invasions include those of the Romans, Crusaders, Mongols, and Turks. As a result of such invasions, Syria has developed a very large ethnic diversity. Although there are a number of different religions, the two religions that make up the vast majority of the population are Alawite Shias and Arab Sunnis.