Looking for a 6 days Northeast Vietnam itinerary to discover spectacular landscapes of the border mountains. This Ha Giang Cao Bang Lang Son loop crosses the most emblematic sites of the region by following the historic RC4 road. This 6-day North Vietnam adventure itinerary starts with the vestiges of Lang Son then continues towards Ban Gioc Waterfall before ending at the Dong Van Karst Plateau. This Ha Giang Cao Bang Lang Son itinerary provides a balanced distribution of two days per province to explore each destination in depth. This Northern Vietnam itinerary 6 days offers total cultural immersion with local ethnic groups and guarantees an authentic adventure for travelers seeking wild nature. This comprehensive travel guide helps adventurers navigate the remote limestone peaks while visiting traditional villages and majestic natural wonders throughout the entire mountainous border region.