The lakes of Saturn’s moon Titan (seen in a synthetic-aperture radar montage above) are most likely composed of methane and ethane: two natural gases which boil at a chilly −161.5 °C and −89 °C respectively. Compared to that, Australian winter weather is warm!
Unlike the mountains of Titan, the lakes are named after lakes on Earth, while the larger maria are named after sea-monsters like the Punga and the Kraken. In reality, there are no sirens on these seas. Well, probably not.