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As long as you've got proper knobblies and ground clearance, you can go almost anywhere given patience and intestinal fortitude. I once, mistakenly, took my XR650, on Baja gearing, up a super-technical, big boulder strewn, double black diamond. In the dark. Eventually got to the top but have never been so utterly fucked in my entire life. I was hallucinating from about 2/3rds of the way up and couldn't remember if my mate was in front or behind. We eventually got to the destination looking like the scrag end of the moto extras from Mad Max. Brutal.
DR200 would do almost anything other than deep sand I reckon.
Himalayan has no ground clearance so doesn't fair well in lanes around Snowdon and mid Wales.
Unless we are talking big hill climbs there aren't many places where I couldn't get a DR200/350 with off road tyres.
It's top speed is whether it's suitable to ride there or van there and then ride. Tbh a dr200 has better bhp per tonne than a Himalayan and that is fine.