High-Elevation Glacial Lakes of Austria

The alpine lakes of Austria were carved by the expansion and retreat of massive Pleistocene glaciers. As the ice sheets receded through terminal moraines, deep rock basins were scoured into limestone and crystalline bedrock. Fed primarily by snowmelt, karst springs, and subterranean aquifers, these lakes are celebrated for high drinking-water purity, vibrant emerald hues, and intense thermal stratification.

1. Lake Achensee: The Tyrolean Fjord

Situated at an elevation of 929 meters between the Karwendel Mountain range to the west and the Rofan Mountains to the east, Lake Achensee is Tyrol’s largest body of water. Reaching depths of up to 133 meters, the lake is classified as oligotrophic, resulting in underwater visibility often exceeding 10 meters. Its north-south orientation creates strong daytime thermal winds, making it a prominent destination for sailing and windsurfing.

Circumnavigation & Access: The western shore features the famous Gaisalmsteig, a scenic walking trail carved directly into the sheer cliffside that connects Pertisau to Achenkirch. Because this narrow path has sections with metal wire handrails and exposed drops, solid footwear is required. The Gaisalm refuge remains the only alpine hut in Austria reachable only on foot or by passenger boat.

2. Wolfgangsee: Salzkammergut Cultural Basin

Located primarily in the province of Salzburg with its eastern tip extending into Upper Austria, Wolfgangsee covers approximately 13 square kilometers at an elevation of 538 meters. The lake is divided into two distinct basins by the narrow peninsula of the Bürgl near Strobl, where depths drop to 114 meters.

The water temperature in mid-summer reaches 22°C to 24°C in surface layers, significantly warmer than higher-altitude bodies of water, making it a primary recreational destination. The historic paddle steamer Kaiser Franz Josef I, operational since 1873, still navigates between the towns of St. Wolfgang, St. Gilgen, and Strobl, providing integrated transit with the Schafberg cogwheel railway station.

3. Plansee: The Ammergau Limestone Fjord

Tucked within the Ammergau Alps near the town of Reutte in Tyrol, Plansee is connected via a 300-meter channel to the adjacent Heiterwanger See. Sitting at 976 meters above sea level, Plansee reaches a depth of 78 meters. Its waters are characterized by low nutrient levels and high concentrations of dissolved minerals, creating a saturated turquoise and sapphire color palette that mirrors the surrounding spruce forests.

Unlike more commercial lakes, Plansee’s shoreline is largely undeveloped, with strict environmental zoning preserving its natural gravel beaches and forested bays. A dedicated 14-kilometer circular shoreline footpath offers continuous, gentle terrain suitable for hiking and distance running.

4. Vorderer Gosausee: Dachstein Reflection Basin

Positioned at 933 meters in the Upper Austrian Salzkammergut, the Vorderer Gosausee is an alpine reservoir directly below the glaciated peaks of the Dachstein massif (including the Gosau Glacier). The water is cold even during mid-summer peaks (rarely exceeding 16°C), fed by torrential meltwater channels.

The perimeter trail around the Vorderer Gosausee is fully accessible (wide, level gravel path, approx. 4.2 km loop), offering clear reflection views of the Dachstein summit. Mountaineers often utilize the lake’s southern banks as the starting point for ascending toward the Hinterer Gosausee (1,154m) and the Adamekhütte at 2,196 meters.

Key Limnological & Navigational Data