45×90 points

The best-known and most frequently visited such point is 45°0′0″N 90°0′0″W / 45.00000°N 90.00000°W / 45.00000; -90.00000, which is 410 m (1,345 ft) above sea level in the town of Rietbrock, Wisconsin near the unincorporated community of Poniatowski.

A grand board and precise metal ground marker was placed by the Marathon County Park Commission, only to be relocated slightly[1] and restored to visitor access since September 12, 2017.

The point has become something of a pop culture phenomenon thanks to Gesicki's Tavern in the tiny cluster of establishments in Poniatowski.

In March 2014, the point was in one of a few strips in a search for the missing Malaysia Airlines Flight 370, after potential debris was spotted by satellite about there.

[6][7] Located in the southern Pacific Ocean, 1,297 km (806 mi) west south west of Guaitecas in Chile, and 3,070 km (1,910 mi) north of Antarctica, 45°0′0″S 90°0′0″W / 45.00000°S 90.00000°W / -45.00000; -90.00000 has an ocean floor depth of 4,180 m (13,730 ft) below sea level.

The original marker for the 45×90 point in North America; the sign was later amended to explain that a marker had been placed on the real location, approximately 324 m (1,063 ft) away.
The search for Malaysia Airlines Flight 370 was near the coordinate 45°S, 90°E. The coordinate is closest to the red dot labeled as Gaofen 1 at the bottom, halfway between the center and left side of the image.