Now he has another opportunity of doing valuable service, none of these positions having been established by observations, and of showing travellers how topography should be worked. He has before him for correction the Hydrographic chart, which pretends to nothing within the Coast, and the 'River Ankobra and Tarquah(!) Gold Mines,' printed in 1878 by Captain Louis Wyatt, then District-commissioner for Axim. This first attempt at a regular survey is meritorious for an amateur; but of course it cannot compare with the produce of a scientific and experienced naval surveyor. We had Lieut. Jeekel, before alluded to, but his scale, 1:250,000, is too small for details. I did not see, till long after our return from this excursion, the then unfinished map by M. Paulus Dahse, a veteran West-Coaster, who has spent years in travelling through the interior. My fellow-voyager also was the first to show me the various cartes printed and published by the late M. Bonnat. [Footnote: _Carte des Concessions de 'The African Gold Coast Company_,' par M. J. Bonnat. Paris, August 1879. Beginning south at Tumento, it does not show the southern fork of the Bonsa or Abonsa River, which falls into the Ancobra's left bank; and it ends a little north of Asseman, the cemetery of the 'kings.' M. Bonnat had already printed in 1877 a _Chart of the River Ankobra_, extending north as far as the 'Gold Mines of Aodoua.'] The Ancobra is an enlarged copy of the Yenna or Prince's River. There are the same swampy borders and 'impenetrable forests,' as Captain Wyatt entitles them; while the mangrove never quite disappears from this true lagoon-stream. The monotonous fringe of rhizophores is broken, about two miles from the mouth, by bamboo-palms and hibiscus-beds, then by the bombax, the rubber-vine, the locust-tree (_inga_), and the banana-plantation. The mounds and hillocks on either side, beginning with the Akromasi and Kabudwe mounds, near the mouth, are evidently parts of an ancient archipelago built by the mangrove and silted up to mainland. The long and curious reaches are shown in my companion's map, and I shall notice only those details which claim something of general interest. After about eight miles' steaming up a huge loop to the west, and a bend easterly, we passed the Kwabina Bosom, or Fetish-Rocks, two wall-like blocks, one mangrove-grown and the other comparatively bare. Contrary to native usage, we chose the fair way between the latter and the left bank, for which innovation, said our escort, we shall surely suffer.