《水经注·卷三十七》
秦统一天下，平定扬州和越州，在东南设了一个都尉，在西北设了一个关侯，开发南海，把罪人迁徙到那边去。
秦并天下，略定扬越，置东南一尉，西北一候，开南海以谪徙民。
When Qin unified the天下, pacified the Yangzhou and Yuezhou, established a military governor in the southeast, a border marquis in the northwest, opened up Nanhai, and sent criminals to settle over there.