Ma Pi Leng Pass belongs to Ha Giang province; it is dangerous road with 20 kilometers length. Over the Ma Pi Leng, there has a mountain with 2.000 meters height located on the 'Happiness' road connecting Ha Giang, Dong Van and Meo Vac town. Ma Pi Leng began building from the 60s of the 20th century by workers who almost are the H'mong. The path length is approximately 200 kilometers. Ma Pi Leng Pass is located in the Dong Van Geoparks which is recognized as the global geoparks. The road along the mountainside has romantic, spectacular scenery that is ideal destination for tourists. Ma Pi Leng Pass is not long but it is the most dangerous pass in the northern border mountain area. It is considered as the “King” of the Vietnam’s pass or Great Wall of Vietnam or the Pyramid of the Meo. At the top of Ma Pi Leng mount is the “happiness” road, there has a stone stele recording the marks in the construction process. The road to the summit, regarded as “Vietnam's Great Wall”, feels like a scene from a fairytale. This is an exquisite winding mountain drive with sharp and blind curves and hairpin switchbacks leading the traveler over the mountains. At the top of the pass there’s a stone stele recording the marks in the construction process.