William Elliot Griffis,
Corea: The Hermit Nation
(1911)
“ The [180] valley of the Yalu is extremely fertile, and well wooded, and the scenery is superb. Its navigation was long interdicted to the Chinese, but steamers and gunboats have entered it, and access to the fertile valley and the trade of the region will be gained by other nations. The Tong-kia River drains the neutral strip. The town nearest the frontier, and the gateway of the kingdom, is Ai-chiu. It is situated on a hill overlooking the river, and surrounded by a wall of light-colored stone. The annual embassy always departed for its overland journey to China through its gates. ”
