Finding the boundaries of an RPG room

I'm making an RPG where the map is stored as characters representing different tiles in a two dimensional array called Map(30, 30). The code is in another thread I posted, if you're interested (http://www.vbforums.com/showthread.p...map-flickering). My issue is, I'd like find a way to only display the room the player is currently in. The rooms can be irregularly shaped. The walls are represented by '#' and doors are represented by 'D'.

Any ideas?