tourism The region is a popular destination for thermal springs. Hamamat Thermal Spring, located on midway from Kırıkhan to Reyhanlı, has a very high sulphur ratio, making it the second in the world after a thermal spring in India. It is the largest spa in the region and attracts many Syrians due to proximity. Haruniye Thermal Spring is located on the banks of the Ceyhan River near Düziçi town and has a serene environment. Thermal springs are a hot spot for people with rheumatism. Kurttepe, Alihocalı and Ilıca mineral springs, all located in Adana Province, are popular for toxic cleansing. Ottoman Palace Thermal Resort & Spa in Antakya is one of Turkey's top resorts for revitalization. Religious tourism Lying at a crossroads of three major religions, namely Judaism, Christianity and Islam, the region is home to numerous landmarks that are important for people of faith. Tarsus is the birthplace of St. Paul, who returned to the city after his conversion. The city was a stronghold of Christians after his death. Ashab-ı Kehf cavern, one of the locations claimed to be the resting place of the legendary Seven Sleepers, holy to Christians and Muslims, is located north of Tarsus. Tarsus was the birthplace of Paul the Apostle. Antakya is another destination for the spiritual world, where the followers of Jesus Christ were first called Christians. It is the home of Saint Peter, one of the 12 apostles of Jesus. Antioch was called "the cradle of Christianity" as a result of its longevity and the pivotal role that it played in the emergence of both Hellenistic Judaism and early Christianity, The Christian New Testament asserts that the name "Christian" first emerged in Antioch. the Church of Saint Peter near Antakya (Antioch) is one of Christianity's oldest churches. Places of interest Ancient sites Kizkalesi (Maiden Castle), a fort on a small island across Kızkalesi township, was built during the early 12th century by Armenian kings of the Rubeniyan dynasty, to defend the city of Korykos (today Kızkalesi). Heaven & Hell, situated on a large hill north of Narlıkuyu, consists of the grabens result from assoil of furrings for thousands of years. Natural phenomena of the grabens is named 'Hell & Heaven' because of the exotic effects on people. From an ancient path, 260 meter long mythological giant Typhon's cave can be accessible. The ancient Roman town of Soloi-Pompeiopolis, near the city of Mersin.