Þórisvatn, lake in Iceland
Þórisvatn is Iceland's largest lake and sits in the southern highlands at an elevation of around 560 to 576 meters. The water originates from the Þjórsá river fed by the Hofsjökull glacier, creating a green hue that stands out sharply against the surrounding black lava and rocky terrain.
The lake has been used as a reservoir for the Vatnsfell Power Station since the early 1970s to generate electricity. This function shaped its purpose in Iceland's energy system and made it integral to supplying power to homes and industries across the country.
The lake's name connects to Icelandic mythology and reflects how the landscape holds cultural meaning for locals. Today, people come here to fish or simply experience the isolation of the highlands in a place far from daily life.
The drive there follows gravel roads deep into the highlands and requires a sturdy vehicle such as an SUV for safe passage. Visitors should bring plenty of supplies and be prepared for rapidly changing weather, as wind and cold are common even during summer months.
Although once thought to have no fish, anglers discovered in the middle of the last century that brown trout actually lived in the lake. Today these fish, found at prime fishing spots like Austurbotnar and Grasatanga, are prized by fishers and known for their size and eating quality.
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