Dehena Falls is an impressive 74m in height and its source is a small spring called Gaslabu Falls. The stream, known as Dehena Dola, flows from Perya Udagama on Dehena Mountain and cascades in twin chutes from the plain of Udaamunatenna. Afterwards the water flows via Pandola to the Bambarakotuwa River.

A small opening in the stone at the base of the pool near the fall is called 'Gathula', meaning 'inside of the stone'. It is said that during heavy rain, the caves surrounding the fall are totally submerged and the road becomes obscured by mist. However, during dry spells the flow is languid. The land towards the top of the fall has been denuded for timber and tea plantations, which has caused the depletion of aquifers.

Take the Ratnapura - Sri Pada road and take the turning at Wevelwatte to Weveldola Valley for 25km. The tree-lined road through the hills is narrow and a four-wheel drive vehicle is recommended. Dehena Falls is one of several here, located between the villages of Pahalagama and Amunugama. The sounds of the fall can be heard before it is visible. Ratnapura rest-house is 21km away.