Pouring over a 200-metre-square crystalline lake for swimming, Tac Tinh Waterfall, Lai Chau stands at a startling elevation of 130 metres. This waterfall cascades down 40-metre-wide rocky tiers in a valley amidst the charming, high Hoang Lien Son Mountains covered with forests. Visit the ruins here, flanked by legends of the Dao ethnic group, for a panoramic view of the waterfall.