Hi Kris, thank you for your great question. In fact, as both countries are in Shengen territory, you can cross the border wherever you want without passport control, unless it is a protected area above the second level of nature protection. At places under higher levels of nature protection (national parks and protected landscape areas) it is mandatory to respect the law of nature protection and visitors’ codes, i.e. the visitors can freely move only on marked paths or cycling routes.
We added the information about the road and train crossings on this page, please see above.
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