Drill straight through the center of the Earth from Hong Kong, China and you'd surface on the exact opposite side of the planet — its antipode.
Hong Kong's antipode sits at 22.32°S, 65.83°W, in the southern hemisphere, west of Greenwich. That places it in or near the Atlantic Ocean.
It lies roughly 20,015 km from Hong Kong — 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 Hong Kong.
Like the vast majority of inhabited places, Hong Kong's antipode falls over open water rather than land — water covers about 71% of the globe, and antipodal land pairs are rare. The nearest coastline, island or settlement is what Antigea shows you when you open the live map, along with the satellite view, the closest Street View, and the local time on the other side of the world.