《水经注·卷三十九》
汝城县在桂阳郡城东三百余里，山又在县东，耒水决无发源于南山的道理。
汝城县在郡东三百余里，山又在县东，耒水无出南山理也。
Ruicheng County is more than 300 miles east of Guilin, and the mountain is east of the county, so it is impossible for Leishui River to originate from Nanshan.