What two cities in Saudi Arabia represent the branches of Islamic religion and are among most important holy cities?

The two cities in Saudi Arabia that represent the branches of Islamic religion and are among the most important holy cities are Mecca and Medina.

- Mecca: Mecca is the holiest city in Islam and the birthplace of the Prophet Muhammad. It is home to the Kaaba, a cube-shaped building that is the most sacred site in Islam. Muslims from all over the world make the pilgrimage to Mecca, known as the Hajj, at least once in their lifetime.

- Medina: Medina is the second holiest city in Islam and the place where the Prophet Muhammad fled to after he was driven out of Mecca. It is home to the Prophet's Mosque, which contains the tomb of the Prophet Muhammad. Medina is also an important center of Islamic learning and scholarship.