Sa Pa Ancient Rock Field

  In short

Here, in Muong Hoa Valley, are found volcanic boulders which are covered with hundreds of petroglyphs. Many petroglyphs are lines – it is possible that there is a kind of "archive" of land borders from the 15th century. There are also other theories about the origin of these petroglyphs as well as many other petroglyphs showing people, home utensils.