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Rhumsiki rock, in the north of Cameroon. This pillar is the funnel of an extinct volcano, where the set rock is extremely hard. The softer rock  mountainside around has long since eroded away.
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Rhumsiki rock, in the north of Cameroon. This pillar is the funnel of an extinct volcano, where the set rock is extremely hard. The softer rock mountainside around has long since eroded away.