It is composed of five villages: Cașoca, Colțu Pietrii, Gura Siriului, Lunca Jariștei (the commune centre), and Mușcelușa.

The Siriu Dam, constructed between 1982 and 1994 and its artificial lake are located in the commune.

In 1972, 10 chamois were brought to Siriu and released in the wilderness of the mountain ranges.

[3] A protected plant, Drosera rotundifolia, can also be found in the Siriu forests.

A document issued by the voivod of Wallachia granted ownership of some land in Siriu to Petru and Lupu.