Does Gangji belong to the outer suburbs of Hefei?

Don't belong. Baidu map shows that Gangji Town is located at the southernmost tip of Changfeng County, Hefei City, Anhui Province, in the northwest corner of the main city of Hefei, 5 kilometers away from the urban area, and does not belong to the outer suburbs. Gangji Town, which belongs to Changfeng County, Hefei City, Anhui Province, is located in the south of Changfeng County and is the north gate of Hefei. It is adjacent to Shuangdun Town in the east, Luyang District in the south, Wushan Town and Feixi County in the west and Shuangdun Town and Wushan Town in the north.