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In page Erfurt:

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The Rennsteig Cycle Way was opened in 2000. This designated high-grade hiking and bike trail runs along the ridge of the Thuringian Central Uplands. The bike trail, about 200 km (124 mi) long, occasionally departs from the course of the historic Rennsteig hiking trail, which dates back to the 1300s, to avoid steep inclines. It is therefore about 30 km (19 mi) longer than the hiking trail.[citation needed]