Yuen Long is the most northwesterly located of the 18 districts of Hong Kong, China, situated in the northwest of the New Territories, surrounded by mountains on three sides and with a flat terrain. Originally a plain with rolling farmland, Yuen Long is the only flat and expansive plain in mountainous Hong Kong, and together with another district, North District, covers the entire land border between Hong Kong and Shenzhen. Yuen Long is full of nature, with the largest number of residential buildings in Tin Shui Wai and Yuen Long town center, while the rest of the area has many walled villages and bungalows. Fairview Park and California Garden are two large private housing estates made up of bungalows, with the size of a small town. As there are many natural areas in Yuen Long, green hills and trees can be seen all around, with the Mai Po Reserve and Lau Fau Shan being the most familiar ones. As for the more densely populated town center and Tin Shui Wai, there are also the Yuen Long Town Park and Tin Shui Wai Park, which are wide and spacious respectively. There is also a Yuen Long Public Swimming Pool at the back. There are many special snacks in Yuen Long. Most of the eateries are concentrated on Avenida Yuen Long and Education Road and On Ning Road in Yuen Long town center. Foods that the town center is famous for include B Tsai cold noodles, Heng Heung's wife biscuits and traditional biscuits of Wing Wah Bakery. In addition, the public can shop at Yuen Long Plaza and Happy Plaza, and together with a wide variety of small stores in the neighborhood, where they form a diversified shopping area. Yuen Long has a large number of monuments and relics. In 1993, a "Ping Shan Heritage Trail" was opened to link up a number of buildings of historical value, such as the Tang Ancestral Hall, Sheung Cheung Wai, Hung Shing Kung, Yeung Hau Temple, etc. At the end of the trail there is the "Gathering of Stars Building", which is a hexagonal-shaped pagoda and the only remaining ancient pagoda in Hong Kong. According to the genealogy of the Tang Clan, the tower has a history of more than 600 years.