Trnovačko Lake is a lake within the Sutjeska National Park of southern Bosnia and Herzegovina. Located at an altitude of 1600 metres, it is a popular with local summer campers. It is 700 metres (2,300 ft) long and 400 metres (1,300 ft) wide set amidst a "huge amphitheater of rocky peaks". The lake is drained from the Maglić, the Volujak and the Bioc hill ranges. The north side of the lake which is open has the wooded Vratnice. The lake water has a deep green-blue colour.