Partial: Can’t quite work out the final location

Solving the grid:

1:

Simply filling in as many borders between shapes as possible to start (I’m sure I’ve missed plenty here), which is helped a lot due to a lot of adjacent colours requiring borders:

2:

Clean up any missed borders, and can start applying symmetry to some of the shapes.

3:

Same as last time, as more borders are placed it creates more obvious symmetries for other shapes.

We have an interesting situation bottom left, were the only fit for the bottom three left cells must be to a vertical bar creating a W shape.

At this point start shading in any rooms that aren’t already fully shaded just to help visualise

4:

The grid is filling in nicely, we have some forced shapes at the top of the grid which domino down through the grid, in particular the circle top middle solves nicely:

5:

Some trickier final deductions, there are now some cells which can only be reached by certain shapes, in particular in the top left and bottom right. By considering these cells, we can place enough borders where everything finally falls into place (note I made an earlier mistake with a blue horizontal bar on the left earlier, which luckily became immediately apparent):

Now I think the next step:

Is to split the grid into two. Purple is the combination of red and blue, so if we separate the colours into two grids we get:

Which seems to be the right thing to do as it gives some distinct shapes, however my geography knowledge is poor and I can’t quite decipher these

Will keep looking for the final answer, if anyone else finds it first feel free to post it as your own answer!