(a) On an outline map of Nigeria, locate and name
(i) one inland drainage basin
(ii) three rivers that flow into the basin
(iii) the Bight of Benin and Bight of Bonny
(iv) the Idanre Hill, Oban Hills and Biu plateau

(b) Account for the shallowness of the rivers and the lake of the inland drainage basin (c) Describe any four benefits of the lake.