Alagalla (Sinhala: අලගල්ල, literal translation: Tuber rock) Mountain Range is situated at the boundaries of the Central and Sabaragamuwa Provinces in Sri Lanka.

The famous Balana Fort which functioned as a strategic rock fortress and an outpost to Kandyan kingdom was built between Kadugannawa Pass[1] and Alagalla Mountain Range.

However, extending the already working Colombo-Ambepussa (අඹේපුස්ස) mainline[2][3] across the Alagalla mountain to Kandy proved to be extremely challenging as it had to be navigated around a waterfall, Meeyan Ella (මීයන් ඇල්ල) about 100 ft (30 m) high falling directly on the planned route and across a steeply inclined solid rock of more than 1,000 ft (300 m) thick.

However, this railway route was found to be dangerous, especially in the rainy season as heavy rains caused the swollen waterfall and slip rocks to damage the trains and the rail tracks.

The 6-metre-high (20 ft) Dekinda ella (දෙකිඳ ඇල්ල) waterfall, served by the Alagalla forest reserve,[10] can also be viewed slightly off-route.