Jawatha Mosque, also known as Al-Kilabiyah, is one of the earliest mosques in the history of Islam, located in the Al-Ahsa Oasis in the Eastern Province of Saudi Arabia. This mosque holds significant historical importance as it is believed to be the second mosque where Friday prayers were offered after the Prophet's Mosque in Medina. Constructed in 629 AD by the tribe of Bani Abdul Qays, the mosque was initially built using mud and palm trunks. Although it was destroyed and renovated several times over the centuries, some original features still remain. The site attracts visitors interested in the early history of Islam, archaeology, and religious studies. While the structure today is quite modest compared to other historic mosques, its significance lies in its storied past and its pivotal role in the spread of Islam in the region.