Antarctica does have a place ID, but at least some parts of the API don’t handle it properly. see https://forum.inaturalist.org/t/strangeness-when-trying-to-use-antarctica-places/14038. if the identification endpoint doesn’t handle the place, then since project ID, bounding box, and obs ID don’t seem to be parameter options, there might not be a way to find identifications directly, though you might be able to get at them indirectly by searching for observations using a bounding box and filtering on update date and identification user ID. or else maybe create a place or places that the API will handle.
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