(VOVWORLD) - Meo Vac district, one of four districts in Ha Giang province located in the Dong Van Karst Plateau Global Geopark, is famous for its diversity of ethnic groups, for its superb limestone mountains, and for the Nho Que river, which looks like a strip of blue silk winding through the Ma Pi Leng pass. Today Discovery Vietnam will take you on a boat tour of the picturesque river.