Mapping the western end of the Sauron's Road is difficult, because the detailed description in the text of The Lord of the Rings, and the detailed map of the same area, do not quite agree with one another.
According to the text, the road ran onto the slopes of Mount Doom from the east, then turned southward and circled upward around the mountain to reach Sammath Naur high on its eastern side. Meanwhile the large-scale map shows the road turning southwards some way short of the mountain, then approaching Orodruin from the southwest.
On this composite map, we've incorporated both of these descriptions of the roads, treating the road from the large-scale map as widely circling Mount Doom, and adding the spiralling route described in the text as an inner road running up to the Cracks of Doom. It is unlikely that such an arrangement was realistically intended, but it seems to be the only approach that matches both the canonical sources.
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