Cyclists have to be able to ride on sand. [Photo provided to China Daily]

For the moment the tours are restricted to two days for health and safety reasons, says Han Bing, of the Hunchun Tourism Bureau.

The tour starts from Quanhe Port in Hunchun, from which the riders head for Won-Jing Port in the DPRK, through which they enter the country after completing immigration procedures. They then ride along the Tumen River and pass through localities such as the port of Rason, and cover a total of about 90 kilometers by the time they are back in Hunchun.