Pursuant to Section 4 of the Act CCIII of 2011 on the Elections of the National Assembly, the electoral constituencies are linked to the size – in terms of voters – of the administrative counties and have to be contiguous, i.e. that they cannot cross the counties’ boundaries. The constituencies have to be revised when the administrative counties are changed and when the deviation between constituencies is too high. The average deviation in the number of registered voters must not exceed 15 per cent countrywide, unless this is justified by “geographical, ethnic, historical, religious and other local characteristics” – provided that it does not exceed 20 per cent; otherwise, Parliament has to amend the relevant annexes of Act CCIII of 2011.