Jerma belongs to the basin of drainage of the Black Sea.
Jerma takes its source in the still preserved area of Krajište, in the south-east of Serbia. It forms its course between the artificial lake of Vlasina and the border with Bulgaria, runs in direction of the North-West on the Eastern slopes of the mount Gromada; it crosses the village of Klisura, after which it enters the area of Znepolje (into Bulgarian, Znepole/Знеполе). It crosses the border then first once at Strezimirovci.
Under the name of Erma, the river continues its race in the area of Znepolje by circumventing the Eastern slope of the mount Ruy. After the town of Tran, the center of the area, it is also known under the name of Transka reka . Erma passes near the villages of Glavanovtsi and Turokovtsi, where it obliques towards north while crossing Tran. After Tran, Erma dug the throat of Transko zhdrelo (" Gorges with Tran"). After the throat, the river receives its principal affluent, Yablanitsa, right before returning to Serbia at the end of a race of 26 km to Bulgaria. It crosses the border at the villages of Bankya (Bulgaria) and Petačinci (Serbia).
Again in Serbia
Jerma generally continues its race towards north. It passes to Iskrovci and Zvonačka Banja, a picturesque thermal spa. It runs then between the mounts Greben and Vlaška planina, close to the villages of Trnsko Odorovce and Vlasi, like close to the monasteries of Sveti Jovan , Sveti Nikolaj and Sveta Bogorodica , before being thrown in the Nišava, in the south-east of Pirot. She will have traversed 48 km in Serbia.
In the last part of its course, Jerma crosses the field of Sukovo, thus named because of the village of Sukovo, which is not located on banks of the river itself but a little with the west. In this sector, it is also known under the name of Sukovska reka (in Serbe Cyrillique: Суковскарека, the " river of Sukovo").
Jerma has a potential of hydroelectric production which is not exploited any more.
Mala Prosvetina Enciklopedija , 3rd (1985); Prosveta; ISBN 86-07-00001-2
- Jovan Đ. Marković (1990): Enciklopedijski geografski leksikon Jugoslavije ; Svjetlost-Sarajevo; ISBN 86-01-02651-6
Internal bondList of the rivers of Serbia
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