Dongguan belongs to Guangdong province, which is a prefecture-level city in Guangdong province and does not belong to other cities. Dongguan is located in South China of China, south-central Guangdong Province, east of the Pearl River Estuary, connected to Guangzhou in the northwest, Shenzhen in the south and Huizhou in the northeast, which promotes the integration with Guangzhou port and urban rail transit. Geologically, Dongguan City is located in the northeast of Boluo fault and the southwest of Luofushan fault edge, and is in the Dongguan fault basin. The terrain is high in the southeast and low in the northwest. The landform is mainly hilly platform and alluvial plain, with mountainous southeast, especially in the east. The mountain is huge, strongly divided, concentrated in pieces and fluctuating, with an altitude of 200-600 meters and a slope of about 30 degrees. The main peak of Yinpingzui Mountain is 898.2 meters high, which is the highest peak in Dongguan.
Jieyang, nicknamed "Lingnan Water City", is a prefecture-level city under the jurisdiction of Guangdong Province, one of the cities in Shantou-Chaozhou metropolitan area, and located in the center of the geographical axis between Guangdong-Hong Kong-Macao Greater Bay Area and Haixi Economic Zone. It has jurisdiction over 2 municipal districts and 2 counties, and manages 1 county-level cities. Jieyang is the largest city in Chaoshan area, located on the eastern coast of Guangdong Province, bordering Fengshun County and Wuhua County in Meizhou City in the north, Nanhai in the south and Shanwei in the west. The total area of the city is as high as 5,265 square kilometers, which is close to the sum of Shantou and Chaoshan, and the population of 5,577,800 also ranks first in Chaoshan.