Tingstäde träsk, Second largest lake in Gotland, Sweden.

Tingstäde träsk is the second largest lake on Gotland, stretching across a wide area with an extended shoreline. The shallow water allows easy exploration and is surrounded by forest that shapes the entire landscape.

In the 12th century, builders constructed a wooden platform called Bulverket in the lake's center, serving as an important structure for that era. This construction shows early settlement patterns and how local people used the lake.

The name Tingstäde refers to the thing assembly held north of Tingstäde Church beside the lake, while träsk is an old Gutnish word for lake. A local saying, "Det rökte så som när Tingstäde träsk brann", recalls how the lake settlement may have been destroyed. A model of Bulverket is displayed at Gotlands museum in Visby.

The lake lies beside road 148 at Tingstäde in northern Gotland, with the shore reached from the village. The water surface sits 44.1 m above sea level. Fishing is forbidden since 2015, so bring no rods; the shallow, reed-fringed edges shown in photographs are best visited outside the summer flight season, when the lake once served as a seaplane landing site.

The lake bed still holds the remains of Bulverket, a 170-by-170-metre square timber platform built in the 1120s with closely packed wooden houses on top. Why it was raised in the middle of the water remains unanswered, and no burnt or charred logs have been found, though a local saying recalls the time "it smoked as when Tingstäde träsk burned". A model is displayed at Gotlands museum in Visby.