Comănești administrative settlement lies about 10 km along the river valley Trotuş, in its midpart. Among Trotuş rivers, the most important, with a catchment area of 24kmp within the administrative territory is Șupan River.

The geographical position of Comăneşti, crossed by National Road 12A and the railway built more than 100 years ago, includes it in the Circuit transit through Ghimeș - Făget, making the connection between Moldavia and Transylvania.