Electoral geographies are those that are defined for the purpose of electing politicians to local and central government. and other bodies such as the European parliament. Examples of electoral geographies include Electoral Wards, Parliamentary Constituencies and European Electoral Regions. Electoral geographies change often. Redistricting often takes place for each election. As the underlying population changes, how the electoral boundaries are drawn needs to be changed to reflect change in the underlying population if the electoral process is to remain representative and the potential for gerrymandering is to be reduced.