It's a bit too close to the mouth of the river. The setting of SW would be much further upstream. Plus, we don't know for 100% sure that the river in MO is the Mongo.
If we assume that it is the Mongo, take a look at the attached image taken from the octagon map on the bottom right. You can see few wiggles in the river further upstream from the main map that could also possibly match the SW map.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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