Drill straight through the center of the Earth from Beijing, China and you'd surface on the exact opposite side of the planet — its antipode.
Beijing's antipode sits at 39.90°S, 63.59°W, in the southern hemisphere, west of Greenwich. That places it in or near the Atlantic Ocean.
It lies roughly 20,015 km from Beijing — 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 Beijing.
Beijing's antipode falls over open water, in or near the Atlantic Ocean — water covers about 71% of the globe, so antipodal land pairs are rare. The nearest named place is Cuartel X, an area in Argentina, roughly 39 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.