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Source: Wikimedia Commons Probably the easiest and most durable version is the use of cairns. Provided there is enough rocks around, they are easy to build, unaffected by bleaching of the sun and...
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Source: Wikimedia Commons Probably the easiest and most durable version is the use of cairns. Provided there is enough rocks around, they are easy to build, unaffected by bleaching of the sun and...