>>11782298It's called an antipode, OP. You can look up fun map websites for it. Also FPBP, and to expand a bit: Since the surface is mostly water and most of the land is in one hemisphere, meaningful antipodes (one populated land place to another of any interest) are pretty rare.
Pic related shows all the antipodes in orange. The most interesting one by far is New Zealand to Spain/Western Europe. Then South America and SE Asia a bit, the fuckall Oceania islands map to Africa but who cares. North America is bupkis in the south Indian Ocean (though someone has Kergulen it looks like). Notice also how the Canadian Arctic/Antarctic maps are also meaningless (nobody lives there).