The name stems from the fact that the regency is located to the west (in Javanese "kulon") of the Progo River.
regency | Regency | Banggai Islands Regency | Sleman Regency | Regency (Indonesia) | Malinau Regency | Karimun Regency | Kampar Regency | Dharmasraya Regency | Berau Regency | West Bandung Regency | Tangerang Regency | Regency architecture | Majalengka Regency | Langkat Regency | Kuningan Regency | Jombang Regency | Indramayu Regency | East Kutai Regency | Belu Regency | Banggai regency | Asahan Regency | Alor Regency | Agam Regency | Tojo Una-Una Regency | Temanggung Regency | Tana Toraja Regency | South Tapanuli Regency | Simalungun Regency | Sanggau Regency |