No, they didn't count tiles for mountains, but they counted cities for mountains across the board. That is, they continuted across connected land masses including all the mountians. So, by the end of the game, the central landmass had 21 cities connected to it so we were scoring 42 points in the last couple turns of the game. It didn't take long to figure out that we were doing it wrong, but we finished the game that way anyway and then I asked to look at the rulebook and pointed out the error.