'the watchtower citadel'), also known as al-Zirin Fort (Arabic: قلعة الظيرين),[1] was a citadel in the eastern outskirts of the walled town of Riyadh in present-day Riyadh, Saudi Arabia.

The fort functioned as a security checkpoint for travelers passing through the town at the time of Second Saudi State in the 19th century.

[2][3] It was again restored in 1936 by King Abdulaziz ibn Saud and finally demolished in the period 1954–1957 during the reign of King Saud bin Abdulaziz when the city underwent expansion.

[4][5] The fort lent its name to the Margab neighborhood in the city's downtown, where it stood.

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