bocac artificial lake in the canyon of the river vrbas near banja luka,

bocac artificial lake canyon river vrbas banja luka accumulation balkans banjaluka beautiful bosnia herzegovina cliff cloud curve day environment europe forest gorge gorgeous green hill horseshoe band landscape magnificent meander mountain mrkonjia grad nature nobody outdoor reservoir riverbank scenery scenic splendent stone summer tourism travel view vista water winding aemernica manjaca cemernica mountains towns knezevo mrkonjic