Not far from Chiang Mai is a canyon. The Thais even call it the Grand Canyon. In fact, this is a quarry, and the word "grand" does not fit him at all.
It is located about 20 km southwest of the city center. On the road you can see a small sign with the inscription "Grand Canyon". It is better to follow in this direction, and not on the navigator. Some maps will show you a different path that will not take you to the quarry itself. At the end of the path you will see tall houses that will not allow you to pass further.