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There is new (?) category of extreme by area and that is the most central cache.
I know how to find all other types by any country/county but here i don't know where to find it; don't know any easy way nor any long and painful one
There isn't really a good way to find these as there's currently no tool for them.My suggestion for a "long and painful way" to find them would be to use the northern, southern, western and eastern caches to make a intersection of lines calculation (for example with geocachingtoolbox) and then check the profile stats of people that have found caches in that area for a cacher that have logged the most central cache.