This part of China is home to less than four per cent of China's roughly 23 million Muslims.
The believers are from an ethnic minority known as the Hui.
A group of Muslim grandmothers wander into a mosque behind an ancient city wall shortly before noon prayers on a Friday.
A crowd of 50 soon fill the prayer room.
Ge Caixia is their religious leader, a female imam in the mosque that's dedicated only to women.