Egyptian President Abdel Fattah el-Sisi has warned that “all options are open” after the latest round of talks between his country, Sudan, and Ethiopia about the Grand Ethiopian Renaissance Dam being built on the Blue Nile ended without progress. Al Jazeera explains that the dam has been a source of tension in the Nile River basin ever since Ethiopia broke ground on it in 2011. Downstream neighbours Egypt and Sudan view the multibillion-dollar project as a threat because of their dependence on the Nile River waters, while Ethiopia considers it essential for its electrification and development. Ethiopia’s Water Minister has said his country will continue filling the reservoir during the upcoming rainy season but sought to defuse tensions, saying: “there is no need to enter an unnecessary war. A war can’t start because of water. Water flows if you fight today, it’ll continue to flow tomorrow”.