Samguk Yusa
It was widely believed that Gija Joseon was located in present-day Korea, replacing Gojoseon of Dangun. But some Korean scholars believed that Gija settled west of Gojoseon, based on records from "Geography of Hanshu", and the Korean "Samguk Yusa" that suggests that Gojoseon continued to coexist with Gija Joseon after the migration of Gija. These scholars believed that Gija's influence was limited to western part of Gojoseon. Furthermore, the record in "Samguk Yusa",