My wife and I are birdwatchers. When we travel, we record species of bird we see in each county. We have observed and identified at least three species of birds in 2,283 counties (72% of all the counties in the USA). We had arbitrarily set three as the threshold.
I am claiming that this is a record, as I have never heard of anybody else making a similar tabulation. It is quite common for birdwatchers to maintain a life list of birds they have seen in geographical regions, such as state lists.
We also once were listed in birding publications as the record holders for seeing the most species of birds in Florida in one calendar day in any month of March, but since broken.