From the pinyin romanization of the Mandarin pronunciation of Chinese 燕山 (Yānshān).
Yanshan
- Synonym of Yan Mountains.
1988, The Great Tangshan Earthquake of 1976: An Anatomy of Disaster[1], Pergamon Press, →ISBN, →LCCN, →OCLC, →OL, page 3:The geomorphology has been modified by the flow of Luanhe and several other major rivers which run through the Yanshan mountains and the plain to reach Bohai.
Often redundantly expressed in English as the "Yanshan Mountains".