Penukal Abab Lematang Ilir Regency is a regency of South Sumatra Province, Indonesia. It takes its name from the three main rivers which flow through that area - the Penukal River, Abab River and Lematang River - while the name Ilir means "downstream". The town of Talang Ubi is the administrative centre of this regency. The regency borders Musi …Penukal Abab Lematang Ilir Regency is a regency of South Sumatra Province, Indonesia. It takes its name from the three main rivers which flow through that area - the Penukal River, Abab River and Lematang River - while the name Ilir means "downstream". The town of Talang Ubi is the administrative centre of this regency. The regency borders Musi Banyuasin Regency to the north, Banyuasin Regency, and Muara Enim Regency to the east and the south, and by Musi Rawas Regency, and Muara Enim Regency to the west.