there are lots of ways to get this information. if the earlier suggestions in this thread aren’t working for you, i would:
- get your species in that place
- get all species in that place
- compare the two sets
or you can try one of the other suggestions mentioned here or in other threads in the forum: https://forum.inaturalist.org/t/how-to-search-for-1st-records-in-a-region/25114/8.