Siyuan Pass Introduction
Siyuan YaKou is located at the border between Taichung City and Yilan County, within Datong Township of Yilan County. It has an elevation of 1,948 meters and is the lowest saddle point where the Nanhuda Mountain Range and the Taoshan Mountain Range converge. It serves as the watershed between the Lanyang River and the Dajia River, as well as the boundary between two different climates. Formerly known as Biyanan, the name is derived from the Atayal language meaning "the place where ancestors once came." The Japanese rendered it phonetically as "Biyanan," and later the government changed the name to "Siyuan," meaning "thinking of the source of drinking water." The term "YaKou" refers to the depression where two mountains connect. The area is primarily covered by warm-temperate forests, with species such as red cypress and flat cypress on the upper slopes, while other areas host fragrant nanmu, black heart wood, red birch, and yew. It also nurtures a diverse array of wildlife, insects, and other natural ecosystems. Siyuan YaKou connects the Xueshan Mountain Range and the Central Mountain Range, resulting in distinct seasons and beautiful scenery. In spring and summer, flowers bloom abundantly, while in autumn and winter, leaves change color and fall. If there is sufficient moisture, there is a chance of snowfall, presenting a picturesque view akin to that of northern countries.
