The straightforward reading of Takamagahara is cosmological: a heaven above the earth, not a location one could travel to. That reading is complicated by a persistent local tradition that treats the myths as having happened somewhere in particular. Takachiho, in present-day Miyazaki prefecture on Kyushu, is where local tradition places Ninigi's landing after the descent, and the gorge there is shown to visitors on that understanding; a scatter of other shrines and place names across Japan carry similar local claims to be the true site of one episode or another.
Scholars of Shinto generally treat these identifications as retrospective and devotional rather than as evidence that the compilers of the Kojiki and Nihon Shoki had an actual place in mind when they wrote of Takamagahara. The texts themselves describe a realm reached by a bridge from the sky, not a region reachable by an ordinary journey, and the imperial court that sponsored both chronicles had every reason to keep the ruling line's origin celestial rather than local. The local traditions are correspondingly not something the atlas can resolve either way; they are recorded here as living devotional geography layered onto a mythological realm, not as a rival historical claim requiring adjudication.