Thach An Cao Bang offers beautiful off the beaten path cycling holidays in north east Vietnam. Some of best Vietnam cycle tours are arranged around Thach An include Thach An bike adventures, Thach An cycling holidays, northeast Vietnam road cycling tours, biking northern Vietnam, and Thach An mountain biking trip. Thach An Cao Bang is a mountainous district of Cao Bang Province in the northeast region of Vietnam. The district covers an area of 683 km².