Atlantic Ocean CAYAR OFFSHORE PROFOND SENEGAL ST. LOUIS OFFSHORE PROFOND SENEGAL Kosmos has a participating interest in two exploration blocks offshore Senegal – Cayar Offshore Profond and Saint Louis Offshore Profond. The license areas are adjacent to, and on trend with, our blocks offshore neighboring Mauritania. We first drilled two successful exploration wells offshore Senegal in 2016, which both discovered significant deposits of natural gas. The Guembeul-1 well, which was located approximately five kilometers south of our basin-opening Tortue-1 well gas discovery offshore Mauritania, demonstrated reservoir continuity, as well as static pressure communication with the Tortue-1 well, suggesting that a single large gas accumulation stretches across the maritime boundary between Mauritania and Senegal. The Teranga-1 well, drilled in the Cayar Offshore Profond block approximately 91 kilometers southwest of the Guembeul-1 well, also discovered a very large, material gas deposit and confirmed that a prolific inboard gas fairway extends approximately 200 kilometers from the Marsouin-1 well in Mauritania through the Tortue area on the maritime boundary all the way to the Teranga-1 well in Senegal. Announced in late 2016, Kosmos has a partnership with BP in Senegal (and Mauritania) that combines Kosmos’ exploration expertise with BP’s deepwater development, LNG production and marketing experience. Kosmos holds an effective 30% participating interest in both licenses. BP holds a 60% participating interest. The national oil company Société des Pétroles du Sénégal (Petrosen) holds 10%. PHASE 1 PHASE 2 PHASE 3 PHASE 4 PHASE 5 PHASE 6 EXPLORATION APPRAISAL DEVELOPMENT DRILLING DRILLING