Under the Han, the political center of the former Nanyue lands was moved from Panyu (Guangzhou) south to Jiaozhi. The capital of Jiaozhi was first Mê Linh (Miling) (within modern Hanoi's Me Linh district) and then Luy Lâu, within Bac Ninh's Thuan Thanh district. According to the "Book of Han"’s "Treatise on Geography", Jiaozhi contained 10 counties: Leilou (羸𨻻), Anding (安定), Goulou (苟屚), Miling (麊泠), Quyang (曲昜), Beidai (北帶), Jixu (稽徐), Xiyu (西于), Longbian (龍編), and Zhugou (朱覯). Đào Duy Anh stated that Jiaozhi's territory contained all of Tonkin, excluding the regions upstream of the Black River and Ma River. Southwestern Guangxi was also part of Jiaozhi. The southwest area of present-day Ninh Bình was the border of Jiuzhen. Later, the Han dynasty created another commandery named Rinan ("") located south of Jiuzhen, stretching from the Ngang Pass to Quảng Nam Province.