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The 45×90 points are the four points on earth which are halfway between the geographical poles, the equator, the Prime Meridian, and the 180th meridian.
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45°N, 90°W
The best-known and most frequently visited such point is 45°0′0″N 90°0′0″W which is located on land at 410 m (1,345 ft) above sea level in the town of Rietbrock, Wisconsin near the unincorporated community of Poniatowski. A geographic marker has been placed there by the Marathon County Park Commission. With the increase in use of personal GPS devices, the sign was amended to clarify that the actual 45×90 point is actually approximately 324 m (1,063 ft) away in a field behind the sign; the location of the marker was chosen because of its proximity to the road.
The point has become something of a pop culture phenomenon thanks to Gesicki's Tavern in the tiny cluster of establishments in Poniatowski. They once sold 45×90 T-shirts and registered visitors as members of the "45x90 Club". Since 2006, the Wausau/Central Wisconsin Convention & Visitors Bureau has been the holder of the official "45x90 Club" registration book. The book is on loan from the Gesicki family. Upon becoming a member of the "45x90 Club", the Wausau/Central Wisconsin Convention & Visitors Bureau will give new members a commemorative coin.
45°N, 90°E
The only other 45×90 point located on land is 45°0′0″N 90°0′0″E which has a height of 1,009 m (3,311 ft) above sea level and is located in a desolate region of the Xinjiang Uyghur Autonomous Region of China near the Mongolian border, some 240 km (150 mi) northeast of Ürümqi. Administratively, it is on the border of Qitai and Qinggil Counties. Greg Michaels, an American, and Ru Rong Zhao, a taxi driver from the closest town of Qitai, itself 110 km to the south-southwest, visited this point on April 13, 2004 and documented the visit on the Degree Confluence Project. Their visit shows that there is no monument or any physical sign that recognition has been given to this location.
45°S, 90°E
Located in the southern Indian Ocean, 45°0′0″S 90°0′0″E has an ocean floor depth of 3,197 m (10,489 ft) below sea level and is 1,244 km (773 mi) southeast of the nearest uninhabited island of Île Saint-Paul, 1,480 km (920 mi) northeast of Elephant Spit on Heard Island, 1,569 km (975 mi) east north east of Port aux Français in the Kerguelen Islands, 2,425 km (1,507 mi) north of Antarctica, 2,448 km (1,521 mi) southwest of the closest inhabited land of Augusta, Western Australia, 4,080 km (2,535 mi) southeast of Réunion Island, and 5,550 km (3,450 mi) southeast of Benguerra Island, Mozambique, and 5,800 km (3,600 mi) southeast of Mossel Bay, South Africa.
The antipode of the southern Indian Ocean location is the (45°N,90°W) location in Wisconsin.
In March 2014, the location in the southern Indian Ocean was the subject of an aerial search for the missing Malaysia Airlines Flight 370, after potential debris were spotted by satellite centered on the 45°S, 90°E location.
45°S, 90°W
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 has an ocean floor depth of 4,180 m (13,730 ft) below sea level.
The antipode of the southern Pacific Ocean location is the (45°N,90°E) location in China.