Dvojno jezero (Triglav Lakes Valley) (TILOS / no diving)
Diving is prohibited. Dvojno jezero (the fifth and sixth Triglav lakes, about 1,680 m) lies in the Seven Triglav Lakes Valley, in the first protection zone of Triglav National Park, where ZTNP-1 Art. 15(1)(17) bans swimming, diving and boating; the park's 2012 letter names it explicitly. The atlas sheet praises its colourful underwater plant life and notes an introduced fish school that divides conservationists – the ban exists to protect exactly this fragile habitat.
depth: 0–8.7 m