Why is the small Putuo in Dongqian Lake in Ningbo called Qiandi?

The small Putuo in Dongqian Lake in Ningbo is called Qiandi because there is a long lake called Qiandi, which divides the lake into two halves, hence the name. According to relevant information, Xiaoputuo is in the middle of Dongqian Lake. In fact, it is a long lake embankment named Qiandi, which divides the lake into two halves, hence the name Qiandi.