This employs something we haven't seen before ... a river ending in an arrow, rather than debouching in a body of water. These rivers run all year round, nearly. However, with the lack of rainfall, and especially with an unavailable groundwater table to sustain the river's flow, a small amount of irrigation is enough to cause the river to dry up. The arrow head indicates a non-specific location. Some years the river may get further, others not so far.
In places where a river like this is highly intermittent, meaning it only runs when it rains, then the river is represented by a dashed line. I don't expect we'll see a river like this in these maps for a long, long time, but it's worth explaining its presence anyway.
Aqmescit, incidentally, is modern Simferopol. I'll write more about it later.
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