Although there are several reasons why the place where the party led by HEGURI no Hironari drifted ashore can be identified as the Kingdom of Champa, the most conclusive reason is that "Nihonkokuo ni shokusuru no sho" (Vol. 287, all written in Chinese), drafted by Tang Prime Minister Zhang Jiuling who was notified of the arrival of Hironari and others at Qinzhou, clearly describes that "Hironari and others drifted to Lin-yi."
平群広成一行が漂着した崑崙をチャンパ王国と断定する理由はいくつかあるが、特に欽州到着後、知らせを受けた唐の宰相・張九齢が起草した「勅日本国王書」（全唐文巻287）に「広成等飄至林邑国」と明瞭に述べていることが決定的である。