 The highest point in Qatar is Qurayn Abu al Bawl at  in the Jebel Dukhan to the west, a range of low limestone outcroppings running north–south from Zikrit through Umm Bab to the southern border.The Jebel Dukhan area also contains Qatar's main onshore oil deposits, while the natural gas fields lie offshore, to the northwest of the peninsula.Qatar signed the Rio Convention on Biological Diversity on 11 June 1992, and became a party to the convention on 21 August 1996.