Where are the five capitals of Bohai State in Tang Dynasty in China?

The five capitals of Bohai Kingdom are collectively called Longquan House, Xiande House, Long Yuan House, Nanhai House and Yalu House.

The preliminary understanding of the academic community is as follows:

Attending Longquan House: the ruins of Tokyo City, Ning 'an City, Heilongjiang Province.

Zhongjing Xiande House: Site of West Ancient City in helong city, Jilin Province.

Long Yuan House in Tokyo: Baliancheng Site in Hunchun City, Jilin Province

Xijing Yaruf: Linjiang District, Jilin Province

Nanhaifu, Nanjing: Tucheng, Qinghai (located on the vast plain on the left bank of Nanchuan, southeast of Beiqing County, South Hamgyong Province, North Korea 14 km).