is located in the village of Al-Kilabiyah, about 12km northeast of Hofuf, and the oasis Al-Ahsa, Saudi Arabia. It was the earliest mosque built in east Arabia and most of the original structure is in ruins. The site is still used for prayer.
Jawatha Mosque was built in the seventh year of hijra (c. 629 AD), early in the Islamic period, by hands of the Bani Abdul Qais tribe who lived there before. This mosque is believed to be the first mosque built in Eastern Province and it is where the second Friday congregation prayer in Islam was offered, the first being held at the Prophet’s Mosque in Medina. According to legend, when the Hajr Al Aswad, (Black Stone), was stolen from Mecca by the Qarmatians, it was kept in this mosque for nearly 22 years.
Most of the mosque’s original structure has been lost and it remains in danger of collapse. Only five small mud-brick arches remain. The visible ruins probably date from around the 9th century AD.