Jack, where did you read that China made it all the way to Canada? I thought that was from a book called 1421, the Year China Discovered the World, which is not a credible source. The farthest sea expedition that the Chinese made was in the Ming Dynasty under Zheng He to the Horn of Africa. They farthest land expedition was made in the Han dynasty under Ban Chao. He made it as far as the the Persian Gulf and some say he made all the way to the Caspian.