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Published on 24 March 2025

Hidden details in maps: lake depths

If you take a close look at Switzerland’s topographic maps, you will discover some exciting details – even beneath the water’s surface. The blue contour lines in lakes tell stories of hidden depths and sometimes of human interaction with nature too.

Landscape near Lake Arnen
Map reading is in!

Federal Office of Topography swisstopo

Division Cartography
Seftigenstrasse 264
3084 Wabern