resting black birds on tree

balkans beautiful biological biosphere birds clouds coast cormorant dead deserted destination dry eco ecology ecosystem environment europe fauna flora greece greek housing hydro idyll kerkini lake landmark landscape location macedonia mediterranean migration national natural nature nest nests nidificate nidify outdoor park peace peaceful perched pictorial picturesque reflection refuge relax reserve resort resource resting river scenery scenic serenity serres shelter silence sky skyline still storage striking summer tranquil travel tree trees view