The Kleiner Feldberg with an elevation of 826 metres is the second-highest mountain of the Taunus mountain range in Hesse, Germany. The Großer Feldberg is located in its immediate neighbourhood.
In 1913, a meteorological and geophysical observatory was built there by German meteorologist Franz Linke. In 1988 an astronomical observatory was built on the mountain's top. The source of the Weil River and a small castle of the Limes Germanicus are located at its northern base.
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