Ahh I see it now thanks
Thank you
For simplicity I'm just going to use a white grid, fluff wise it's a giant underground cavern.
In terms of real life? Sure, but speeds don't really match to real life anyway and a whale plays by different rules being in water.
Okay I've filled in the map here:
Spoiler: Grid layout and starting positions
Show
There's 60ft between the front line of the party and Tiamat as discussed, there's roughly a 100ft border around (from the back/sides of Tiamat and the back of the party) to work with for maneuverability. Given her size and the starting distance, any 'indoor' map was always going to be incredibly massive already.