50 meters. According to official website of Nanjing University, the swimming pool in Xianlin Campus of Nanjing University is equipped with an indoor standard pool of 50×2 1 m, which adopts counter-current water distribution, stainless steel quartz sand filter and split-flow ozone disinfection technology. The swimming pool is located in the northwest of the core area of Xianlin Campus. In addition to the corresponding auxiliary facilities, there is also a gym.