In the paragraph, timber is the thick trees that grow on the banks. The way it has grown makes it look as if its a "solid wall". "It was a monstrous big river here, with the tallest and the thickest kind of timber on both banks; just a solid wall, as well as I could see by the stars"
Explanation:
Timber, or trees, on the banks of the river look like a “solid wall.”
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