 The Great Mosque has an area of 4 @,@ 100 square metres ( 44 @,@ 000 sq ft ) . Most of the general structure is constructed from local marine sandstone known as <unk> . The mosque forms a large sahn ( " courtyard " ) surrounded by rounded arches . The Mamluks , and later the Ottomans , had the south and southeastern sides of the building expanded . 
