Ukrina is produced by the merging of Mala Ukrina[hr; sr] (Small Ukrina) and Velika Ukrina[sr; hr] (Great Ukrina) in the village of Kulaši[bs] in the municipality of Prnjavor. The length of Ukrina of origin Great Ukrina (Lukavac) is 119.3km, and the surface area of the basin is 1504km².[1]
↑Vojnogeografski institut, Ed. (1955): Travnik (List karte 1:100.000, Izohipse na 20 m). Vojnogeografski institut, Beograd / Military Geographical Institute, Ed. (1955): Travnik (map sheet 1: 100,000, Contour lines at 20 m). Military Geographical Institute, Belgrade.
↑Spahić M. et al. (2000): Bosnia i Hercegovina (1:250.000). Izdavačko preduzeće „Sejtarija", Sarajevo., The Map
↑Mučibabić B., Ed. (1998): Geografski atlas Bosne i Hercegovine. Geodetski zavod BiH, Sarajevo, ISBN9958-766-00-0., pp: 4-5.
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