China National Highway 221 (221国道) runs from Harbin to Tongjiang, in Heilongjiang Province.

It is 668 kilometres in length and runs northeast from Harbin towards Tongjiang.

China National Highway 112 runs around Beijing Before 2013, Mainland China observed National Highway 228 as Taiwan Ring, composed of several National Expressway (Republic of China) and Taiwan provincial highways, this designation is not recognized by Republic of China (Taiwan).

This observation was eventually dropped in new National Highway plans, replaced by Dandong-Dongxing Highway.

Another extension plan was announced in 2022, including new small purpose connection highways (601-701).