Semi-arid areas that don't show much in the way of major rivers are likely to support more pastoralist cultures rather than farming ones. The spots where the lowlands are closest to the ridges are going to be valleys, which will be likely to collect rain and snow, and thus form rivers. Likewise, there are a couple flowing from the "point" of a mountain range rather than the "pocket," if that makes sense. I would expect it to flow away from the ridgeline first before turning southward, unless it's running in a canyon that isn't obvious from the low resolution of the height data. The westernmost that has its headwaters at a latitude around -15, for instance.
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