traditional malagasy canoes, hollowed out of tree trunks, are moored to the shore

water vehicle river waterway boat sea rock wood coast shore nature traditional malagasy canoes hollowed trunks moored entrance cave calm red-brown sheer cliffs madagascar manambolo moored boat canoe riverboat wooden transportation wooden hollowed-out entrance riverbed hollowed cave exit malagasy tourist cliffs steep slope coastal rock bank riverbank journey reddish exotic travel rocky sheer exotic excursion picturesque manambolo limestone madagascar africa riverside water canyon cliff formation geologic shore river natural nature coast brown