South Pars Field and Qatar North Field, the largest natural gas fields in the world, are Explained in DW.com. The two fields are divided by a maritime line and form an island divided between Qatar and Iran. Israel attacked the South Pars FIeld and Iran retaliated with an attack on Qatar North Field on March 18, 2026. South Pars field natural gas supplies homes in Iran and is used for fertilizer inside Iran. It also supplies Turkey and Bahrain with natural gas. In the absence of this gas Turkey would have to source gas from Russia or buy it on the world markets. Qatar's gas goes to world markets.