One page I found claimed you could also see Ireland from that hill, thus making it 5 countries, albeit only two independent ones.
I plugged “see five countries” into Google and found a handful of sites that claim one can see 5 countries from this or that point. Frustratingly, none of them (except the above) actually said what the five countries are.
For instance, a newspaper article from the New Zealand Sunday Star Times says you can see 5 countries from the summit of Mt Everest. Now two of those will be Nepal and China, of course and you might be able to see mountain peaks in India and Bhutan, but I’m not sure what the other one is. Unless they are counting Sikkim, which is technically not independent. Or is it possible to see Bangladesh from Mt Everest?
Another one talks about seeing five countries from a Crusader castle on an island somewhere in the eastern Med. Again, no indication of which countries.