Here is more Dungeon Vocabulary. Hopefully these will help my players understand what I'm talking about when I try to describe rooms and hallways and so on. Also, I might learn from commenters better ways to describe these . . . or help new GMs figure out how to describe tunnels.
This is how I describe relative locations. This room, for example:
I'd say, "A square room roughly 10 yards across with a door on the left wall in the far left hand corner, a door in the right hand corner of the opposite wall, and a small alcove in the middle of the right wall."
Or something quite like that.
These kinds of areas are tough:
I'd say, "The hallway Ts out in front of you. On the opposite wall to the left of the entrance to the T is a door, and the hallway continues to the left. To your upper right, a hallway continues straight. On the right, the hallway continues."
Or, "The hallway ends in a hallway running left-right. On the opposite wall to the left of the hallway you're in is a door. On the opposite wall to the right of the hallway you're in is a hallway going straight."
These days, I try to draw less of those.
If you've got a better, clearer way to describe these, let me know.