Demarcated area 11 comes into force on 24 January 2023 replacing Demarcated Area 6 (Demarcated area map) which was issued on 21 April 2022.
Daw Ardal a Ddarnodir 11 i rym ar 24 Ionawr 2023 gan ddisodli Ardal a Ddarnodir 6 (map Ardal a Ddarnodir) a gyhoeddwyd ar 21 Ebrill 2022.