Shangzhuang Reservoir

　　Located in the northwest suburbs of Beijing, about 30 kilometers from the city center. Shangzhuang Reservoir was created by constructing a dam on an old river channel. It is roughly 4 kilometers long, with winding sections that vary in width. The reservoir is part of the same waterway as Daoxiang Lake, just separated by a bridge, sharing interconnected waters. Due to the shallower water in the upstream section and deeper water downstream, fish frequently migrate from the upper area to the reservoir to inhabit and breed, resulting in a naturally higher fish density compared to other large reservoirs. The reservoir is home to a wide variety of fish species, including crucian carp, common carp, grass carp, silver carp, bighead carp, catfish, black carp, and mandarin fish. Among them, the largest common carp can weigh over 5 kilograms, and crucian carp around 500 grams are also commonly seen.