Photo - Friedrichshöhle
© Vuxi · CC BY-SA 4.0, https://creativecommons.org/licenses/by-sa/4.0/ · Wikimedia Commons · https://commons.wikimedia.org/wiki/File:Wimsener_M%C3%BChle_03.jpg
Source: Geotopkataster Baden-Württemberg (Regierungspräsidium Freiburg – LGRB) (services.lgrb-bw.de), modified. Data licence Germany – attribution – version 2.0 (dl-de/by-2-0), https://www.govdata.de/dl-de/by-2-0 Datenquelle: Regierungspräsidium Freiburg - LGRB, www.lgrb-bw.de · data as of 2026 · Contains information from Grottocenter (Wikicaves), grottocenter.org, made available under the Open Database License (ODbL 1.0, https://opendatacommons.org/licenses/odbl/1-0/), modified. · length · obtained 2026-11-13 · https://grottocenter.org/ui/entrances/23628 · data as of 2026 · Source: Grottocenter (Association Wikicaves), worldwide collaborative cave database (grottocenter.org), modified. CC BY-SA 3.0, https://creativecommons.org/licenses/by-sa/3.0/ Grottocenter (Wikicaves) · Text by ABC (Schauhöhle) · description · obtained 2026-11-13 · https://grottocenter.org/ui/entrances/23628 · data as of 2026 · Contains information from © OpenStreetMap contributors, www.openstreetmap.org, made available under the Open Database License (ODbL 1.0, https://opendatacommons.org/licenses/odbl/1-0/), modified. · names · obtained 2026-11-13 · https://www.openstreetmap.org/node/4302887157 · data as of 2026 · Source: Wikidata – cave items (Germany) (www.wikidata.org), modified. CC0 1.0, https://creativecommons.org/publicdomain/zero/1.0/ Wikidata (CC0 1.0) · data as of 2026 · The derived data is available on request under the ODbL: [email protected]