# Geo URI scheme |  | The **Geo URI scheme** is a Uniform Resource Identifier (URI) scheme defined by the Internet Engineering Task Force's RFC 5870 as:a Uniform Resource Identifier (URI) for geographic locations using the 'geo' scheme name. A 'geo' URI identifies a physical location in a two- or three-dimensional coordinate reference system in a compact, simple, human-readable, and protocol-independent way. | |-|-| | | wikipedia:: [Geo URI scheme](https://en.wikipedia.org/wiki/Geo_URI_scheme) | A simple geo URI might look like: `geo:25.245470718844146,51.45400942457904` > where the two numerical values represent latitude and longitude respectively,[1] and are separated by a comma.[1] They are coordinates of a horizontal grid (2D). If a third comma-separated value is present, it represents altitude;[1] so, coordinates of a 3D grid. > The geo URI also allows for an optional "uncertainty" value, separated by a semicolon, representing the uncertainty of the location in meters, and is described using the "u" URI parameter.[1] A geo URI with an uncertainty parameter looks as follows: `geo:37.786971,-122.399677;u=35`