Keutschacher See is one of the warm little lakes of Carinthia, tucked into the rolling moraine country south of the Wörthersee, where glaciers of the last ice age left a jumble of hills, hollows and water. It is small and shallow, with reeds at the edges and pine and beech woods around it, and in summer it warms to a temperature that makes the Alpine lakes a few valleys away seem Arctic. Locals swim from jetties and lawns, and the nearby village of Keutschach am See is a quiet place of fewer than five hundred people.
The surprise is below the surface. Around the shores of the Alps, from about 5000 to 500 BC, people built their houses on wooden piles near lakes and bogs, and the waterlogged mud has preserved timbers, tools and pottery in remarkable condition. Keutschacher See is one of the Austrian sites included in UNESCO's listing of prehistoric pile dwellings around the Alps. There is little to see from the shore, since the remains lie under water and silt, but the knowledge that Bronze Age families lived here lends the gentle landscape a deeper time.
The ride around here is soft and pretty rather than dramatic. Narrow, well-surfaced roads wind through farmland and woods with views toward the jagged Karawanks, the range that forms the border with Slovenia, and the traffic is light outside holiday weekends. From here, many riders cross the mountains to Slovenia, where the ride continues to the Idrijska Bela valley and its old timber-flume reservoir, built to float logs to mines. Late spring and early autumn are the sweetest seasons, when the water is calm and mist lies on the lake in the morning. Thunderstorms in summer can arrive quickly.
There are inns and lakeside cafes serving trout and Carinthian dishes such as Kasnudeln, cheese-filled pasta parcels with a crimped edge. Pack swimming gear, since a dip in the lake is the best way to end a day in the saddle.