Swansea had the highest number of caravans on unauthorised sites (34 caravans, accounting for 21% of all caravans on unauthorised sites).
Abertawe oedd â'r nifer uchaf o garafannau ar safleoedd anawdurdodedig (34 o garafannau, yn cyfrif am 21% o’r holl garafannau ar safleoedd anawdurdodedig).