Gross and Net Undeveloped and Developed Acreage The following table sets forth certain information regarding the developed and undeveloped portions of our license areas as of December 31, 2017 for the countries in which we currently operate. Developed Area Undeveloped Area (Acres) (Acres) Total Area (Acres) Gross Net(1) Gross Net(1) Gross Net(1) (In thousands) Ghana Jubilee Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 13 — — 52 13 TEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 19 — — 111 19 West Cape Three Points(2) . . . . . . . . . . . . . . . . . — — 28 9 28 9 Deepwater Tano(2) . . . . . . . . . . . . . . . . . . . . . . . — — 27 4 27 4 Equatorial Guinea(3) Block EG-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 617 247 617 247 Block S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 308 123 308 123 Block W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 557 223 557 223 Mauritania Block C6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,063 298 1,063 298 Block C8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 2,220 622 2,220 622 Block C12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,273 356 1,273 356 Block C13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,452 407 1,452 407 Block C18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 3,268 490 3,268 490 Morocco Essaouira . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 2,171 1,628 2,171 1,628 Sao Tome and Principe Block 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 703 316 703 316 Block 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,241 559 1,241 559 Block 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 2,209 1,436 2,209 1,436 Block 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,738 782 1,738 782 Senegal Cayar Offshore Profond . . . . . . . . . . . . . . . . . . . — — 1,350 405 1,350 405 Saint Louis Offshore Profond . . . . . . . . . . . . . . . — — 1,650 495 1,650 495 Suriname Block 42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,526 509 1,526 509 Block 45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . — — 1,267 633 1,267 633 Total Kosmos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163 32 24,668 9,542 24,831 9,574 Equity method investment(4) . . . . . . . . . . . . . . . . 65 28 — — 65 28 Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 60 24,668 9,542 24,896 9,602 (1) Net acreage based on Kosmos’ participating interest, before the exercise of any options or back-in rights, except for our net acreage associated with the Jubilee and TEN fields, which are after the exercise of options or back-in rights. Our net acreage in Ghana may be affected by any redetermination of interests in the Jubilee Unit. (2) The Exploration Period of the WCTP petroleum contract and DT petroleum contract has expired. The undeveloped area reflected in the table above represents acreage within our discovery areas that were not subject to relinquishment on the expiry of the Exploration Period. (3) Ratification of the petroleum contracts by the President of Equatorial Guinea is required before the petroleum contracts become effective. 29