Tributaries of the Niger traverse the western portion of the country, the most noteworthy being the Gulbin Kebbi or Sokoto river and the Kaduna, which flows through a valley not more than 500 ft.
Above Lokoja, the river terminus of the Northern Nigeria railway; Egga, Mureji (at the Kaduna confluence), Jebba and Bussa.
The administrative headquarters of Northern Nigeria are at Zungeru, on the Kaduna river, in 6° 09' 40" E., 9 0 48' 32" N.
The Kaduna from its confluence with the Niger can be ascended by steamer 50 m.
This was selected on a branch of the Kaduna river in the south-western corner of the province of Zaria, at a place of which the native name of Zungeru was retained.
Sixty miles lower down is the mouth of the (left hand) tributary the Kaduna, a river of some magnitude which gives access to Zungeru, the headquarters of the British administration in Northern Nigeria.
The head waters of the Kaduna are not far from Kano.
Below the mouth of the Kaduna, on the right bank of the Niger, is Baro, the starting-point of a railway to Kano.
The British Blue Books, Correspondence relating to Railway Construction in Nigeria (1905) and Further Correspondence, &c. (1909), contain information about the navigability of the lower Niger and of the Kaduna.
These territories, with the exception of Zaria, were all in the more or less immediate neighbourhood of the valleys of the Niger and the Benue, and Zaria bordered upon the Kaduna.