Nigeria and Equatorial Guinea will work together to secure waters in the Gulf of Guinea, a region plagued by piracy and militant unrest, according to the office of Nigerian President Muhammadu Buhari. Buhari will lead a delegation on Monday to Malabo, the capital of Equatorial Guinea, for concluding talks with President Obiang Nguema Mbasogo and the subsequent signing of an agreement on Tuesday, the Nigerian presidency said in an e-mailed statement on Sunday. The Gulf of Guinea in the Atlantic Ocean straddles both nation’s maritime boundaries. Nigeria is Africa’s biggest oil producer and pumps almost all of its crude from the gulf and the neighboring Niger River delta. Shipments are poised to shrink to a two-year low amid rising pipeline shutdowns linked to sabotages.