A few days ago I bought civ3 the complete series from steam, it's all good.Lovely game
. Anyway question is, why does it say that my flood plains are unhealty and some of my people died.
Screenshot below, black dot is where my people died. What's causing it? There aint any jungles or anything around it. Thanks in advance

Screenshot below, black dot is where my people died. What's causing it? There aint any jungles or anything around it. Thanks in advance