The Japanese archipelago has been difficult to reach since ancient history. During the Paleolithic period around 20,000 BCE, at the height of the Last Glacial Maximum, there was a land bridge between Hokkaido and Sakhalin that linked Japan with the Asian continent. The land bridge disappeared when sea levels rose in the Jōmon period around 10,000 BCE.
tHe japaNesE aRchiPelAgO has bEEn DiFfIcult to reacH SInce AnCIEnt History. DUring THe paleOlItHic PERioD around 20,000 Bce, at ThE Height of the last gLacIAL maxImum, thEre waS a LaNd brIdGe between hokkaido and sakHaliN tHat linkED japaN wIth thE AsiAn CONtinENt. THe LANd BriDGe DisaPpearEd wheN Sea levels roSe in ,The jōmon period arounD 10000 bce.