In the Wilds of Africa, by W.H.G. Kingston.
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The hero of the book gets himself a job on board of a vessel, which has
a number of misfortunes. She loses several officers, then her captain
dies, leaving a totally unsuitable officer, Kydd, in charge. Finally
she runs aground near the shore, where the natives slay some of the
crew. They leave the ship on a raft, Kydd being on one, and our hero
and many other passengers on a second. The latter is picked up by a
fine-looking vessel, that proves to be a Portuguese slaver. They are
attacked by a British man-of-war on slaver-patrol, but manage to get
away from her. They go up a river to a village where, it appears, the
vessel is to pick up a fresh supply of slaves. Our heroes ask if they
can be put ashore here, which is agreed to. From here on the
story runs fast, as our hero and the others travel through "The Wilds
of Africa".
It is quite a long book, and it makes a good audiobook.
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IN THE WILDS OF AFRICA, BY W.H.G. KINGSTON.