Final answer:
Russia is the country that borders China to the north.
Step-by-step explanation:
The country that borders China to the north is Russia. Russia is the largest country in the world and shares a long land border with China called the Sino-Russian border. This border stretches for about 4,200 kilometers (2,620 miles) and is marked by various geographical features such as rivers and mountains.
Learn more about Borders between China and neighboring countries