[Agrajag]

Originally posted by pohtato:
does the type of terrain affect your defense rating or something???

if that is not the case, then it would be wise to build castles on most plains to get higher gold income if possible

Just wanted to explain exactly what Cainehill meant:
Different terrain types affect the province's "stats", a farmlands province is high on gold income, but low on resources and magic sites, a swamp is low on gold and resources but high on magic sites, a mountain province is high on resources and therefor building a castle in it (and doubling its resource value) will net you more resources to use for your high resource units.