I don't recall if the traderoute connects with vision of borders or of cities. I think it's borders. Might be safe to explore a bit further north to be sure, then head back down south to defog the rest.
Kind of a shame with New Flood Central having the tile spread that it does. I don't see any reason to not settle on the plains hill 1W of the copper, but that would leave 2 floodplains unused. Considering it's pure dead tiles around the pair, might be better to just write them off as an unfortunate ungroovy happening.
well, maybe there's something besides desert to the east, still. next turn we'll see what the warrior can see from the bronze hill.