Tu Lan caves system is located in Minh Hoa District, Quang Binh Province, this is the Karst center of 200ha next to Phong Nha Ke Bang National Park. The caves system has been discovered by local fishermen in 2009 and explored by British Cave Research Association (BCRA) in 2010, there were only 3 caves, Tu Lan, Hang Ken and Hang Tien have been explored in 2010 expedition, in 2012 the BCRA expedition came back and explored more caves include Hung Hon, Hang Uoi, Hang Chuot, Hang Son Oxalis and Hang Kim. There are few more caves have been found in 2013 in this area. Tu Lan caves system became popular when Carsten Peter (NatGeo photographer) took a photo in Hang Ken that won so many prizes on National Geographic Magazine in 2011. The caves system is now open for tourist and managed by Oxalis Company Limited, and special caving and jungle trekking company. The intent of Oxalis that to keep this caves system as natural, no construction and housing to be built in this area, the objective is making everybody feel like the first person in the area. There are several tour options from one day to 5 days and from very easy to very hard trek.