High-capacity electricity generation Akosombo Hydroelectric Project contains three main tributaries : the Black Volta ; the White Volta and the Red Volta and the Akosombo Hydroelectric Project flows into the Gulf of Guinea on the Atlantic Ocean . 
The Eastern Region was an administrative region in Nigeria , dating back originally from the division of the colony Southern Nigeria in 1954. Its first capital was Calabar . The capital was later moved to Enugu and the second capital was Umuahia . The region was officially divided in 1967 into three new states , the East-Central State , Rivers State and South-Eastern State . East-Central State had its capital at Enugu, which is now part of Enugu State .