《徐霞客游记·滇游日记二十三》
因此山滕塘其实是平川北边的尽头处，其东南敞开平川让湖水聚集，其西北形成峡谷让水流出去。
是山塍塘者，实川之北尽处，其东南辟而为川以潴湖，其西北夹而为峡以出水者也。
Therefore, Shanteng Reservoir is actually at the end of the northern part of the plain. Its southeast opens up to the plain, allowing lake water to accumulate, while its northwest forms a canyon, allowing water to flow out.