The film shows a walk along the north shore of Lake Thun (Thunersee) which at times is high above the lake and as we approach the eastern end at Unterseen reaches the same level. The road along the northern shore has been cut into the rock creating a unique bus journey. Along the southern shore, although the moutnains above are higher, there is more flat land and the journey from Interlaken to Spiez and then to Thun is much more gentle.
I stayed at two campsites which allowed me to see the lake from both the northern and southern side. From the south, I stayed at Camping Stuhlegg in the village of Krattingen which is located on the slopes of the Nielsen, a mountain over 2,300 metres which dominates the lake. The views overlooking Lake Thun are quite magnificent and one can take the local bus service to Spiez and from there there are contacts to other places such as Thun either by bus, rail - or boat on the lake. Visitors can obtain a pass for the Thun region which is free of charge and then they can use that for transport on the buses and which gives a variety of discounts to attractions in the area.
The second resort I stayed at was Camping Alpenblick which is located at the eastern end of the lake and the bus from here travels around the northern shore to Thun.
The lake was created after the last glacial period. After the 10th century, it split from Lake Brienz, before which the two lakes were combined. Lake Thun's approximate 2,500 km² catchment area frequently causes local flooding after heavy rainfalls. This occurs because the river Aare, which drains Lake Thun, has only limited capacity to handle the excess runoff. The lake is fed by water from Lake Brienz to the southeast, which is 6 metres higher than Lake Thun, and various streams in the Oberland, including the Kander.
In 1835, passenger ships began operating on the lake. Ten passenger ships, operated by the local railway company BLS AG, serve the towns of Interlaken and Thun; the Interlaken ship canal and Thun ship canal connect the lake to Interlaken West railway station and Thun railway station respectively.