This question is similar to What would happen if there was no wind?, but the lack of wind is confined to a small portion of the planet. To make things concrete, the affected region is roughly circular with a radius of about 150 km. The entire region is affected by magic that causes the wind outside to flow around the edges of the circle as if the whole area were covered by a glass dome.
To make things concrete, here are the details on the affected region:
- It's roughly circular, with a radius of about 150 km.
- Magic causes the wind from outside to flow around the edges of the circle, more or less as if the whole area were covered by a glass dome.
- The clouds follow the path of the wind, so there's no rain and the skies are perpetually clear (which also means the area around the perimeter gets more rain than it normally would).
- The terrain is plains and rolling hills, with rivers flowing in from outside the affected region.
The question is, do the rivers and other processes distribute enough water throughout the area to prevent most of it from becoming a desert in the absence of wind and rain? Or are we inevitably left with small fertile areas around the rivers and desert everywhere else? I was specifically envisioning the area as a place for small nomadic hunter-gatherer societies, so it wouldn't need to support agriculture, irrigation, etc.