Siming District is an urban district of the city of Xiamen, Fujian province, China. It includes the territory of the old town of Xiamen and the government offices of the modern sub-provincial city. Siming occupies the southern half of Xiamen Island. It also includes Gulangyu Island to its southwest. The sheltered Yundang Bay responsible for old Xiamen's …Siming District is an urban district of the city of Xiamen, Fujian province, China. It includes the territory of the old town of Xiamen and the government offices of the modern sub-provincial city. Siming occupies the southern half of Xiamen Island. It also includes Gulangyu Island to its southwest. The sheltered Yundang Bay responsible for old Xiamen's prized harbor was converted into a lake in the 20th century by the addition of landfill from construction.