aerial
aerial view
background
big kalin
bulgaria
clouds
dam
drone
environment
europe
forest
green
hiking
hill
kalin
kalin dam
kalin reservoir
karagyol
kyustendil region
landmark
landscape
mountain
mountaineering
national park
nature
outdoor
panorama
park
pastra
peak
recreation
reservoir
rila
rila mountain
rila national park
road
rock
rocks
route
scenery
small kalin
tourism
trail
transportation
travel
water