Old Cameroon River is? James Holman (Travels in Madeira, Sierra
Leone, Teneriffe, St. Jago, Cape Coast, Fernando Po, Princes Island,
Etc. Etc, London: G. Routledge, 1840) describes how the British man-of-
war he was on got lost while going up the Cross River to Duke Town and
said they mistakenly sailed
into the Old Calabar River, where they got stuck on a mudflat.
Also, is the Cross River in the Niger Delta? Looking at a map it
doesn't appear to be, but some sources include it in the Delta.