The Ruisui Tropic of Cancer Marker () is a monument marking the Tropic of Cancer in Ruisui Township, Hualien County, Taiwan.
The monument was originally constructed in 1933 west of Ruisui Railway Station. Due to the HualienâÂÂTaitung line tracks replacement work carried out in 1981, the monument had to be relocated to Wuhe Terrace and placed along the Provincial Highway 9.
At noon on 22June every year, the monument shows no shadow due to the position of the sun exactly above it.
The monument is accessible within walking distance south of Ruisui Station of Taiwan Railway.