Both the fauna and flora of the higher levels present close affinities with those of Mount Elgon, of other mountains of East Africa and of Cameroon Mountain.
Meantime in 1903 the then Eastern province of the Uganda Protectorate had been transferred to the adjoining East Africa Protectorate, the new eastern boundary being the west coast of Lake Rudolf, the river Turkwel, the eastern flanks of Mt Elgon, the Sio River, and a line running south from the mouth of the Sio across Victoria Nyanza to 1° S.
The Eastern province is abundantly watered near Victoria Nyanza and around Mt Elgon and the noble Debasien mountain (about 50 in.
Busoga and the western part of the Elgon district in this province have a regular West African climate - hot, moist and not over-healthy.
Mount Elgon (q.v.) just outside the Eastern province is one of the leading physical features of the Uganda and East Africa protectorates.