The 45×90 points are the four points on Earth which are both halfway between one of the geographical poles and the equator, and halfway between the Prime Meridian and the 180th meridian. Both northern 45×90 points are located on land, while both southern 45×90 points are in remote open ocean locations.

The Town of Rietbrock is located in Marathon County, Wisconsin, United States. It is part of the Wausau, WI Metropolitan Statistical Area. The town contains one of the four 45×90 points of the world, where the 45th parallel north and 90th meridian west intersect. The population was 981 at the 2010 census. The unincorporated communities of Poniatowski and Schnappsville are located within the town.