The đàn tranh is a plucked zither of Vietnam, which is similar to the Chinese guzheng , the Japanese koto, the Korean kayagum and the Mongolia Yatga. In northern Vietnam, the instrument is also known as the đàn thập lục. It has a long soundbox with the steel strings, movable bridges and tuning pegs positioned on its top.

The đàn tranh can be used either as a solo instrument, as part of various instrumental ensembles or to accompany vocal performances. (source)