Drill straight through the center of the Earth from Buenos Aires, Argentina and you'd surface on the exact opposite side of the planet — its antipode.
Buenos Aires's antipode sits at 34.60°N, 121.62°E, in the northern hemisphere, east of Greenwich. That places it in or near the Pacific Ocean.
It lies roughly 20,015 km from Buenos Aires — about as far apart as two points on Earth can possibly be. And the relationship is symmetric: the antipode of that spot is, of course, right back here in Buenos Aires.
Buenos Aires's antipode falls over open water, in or near the Pacific Ocean — water covers about 71% of the globe, so antipodal land pairs are rare. The nearest named place is Yancheng State Power Investment GCL Binhai power station, a facility in China, roughly 130 km away.
Antigea's live map shows the satellite view, the closest Street View, and the local time on the other side of the world.