Dungeoneer Map-card questions

Hey all,

I'm just wondering if there are any restrictions about which wilderness cards can be placed next to each other. I.e. Can Urban cards only be placed next to other cards with the Urban designation? Or, can any wilderness card be played next to any other (thus, there are only 2 kinds of map card, wilderness and dungeon)?

Thanks!

there are no restrictions what wilderness Map cards may be adjoining, so long as all basic Map rules are followed (no stranded spaces, parallel placement, etc.)