The list of national coordinate reference systems (CRS) lists geographic projections officially recommended for existing countries. Given that each geographic projection of a country and its spheric reality onto a plane surface generate specific and well known distances, shapes, areas deformations, each country needs are different in order to reduce these distortions. Also, each country, in order to represent its geographic space, need to choose a suitable, low distortion geographic projection. These national projections, or national Coordinate Reference Systems are officially announced by the relevant national agencies. The list below is a collection of available official national Coordinate Reference systems.