There are many different pronunciations for the name of the new region floating around…
-Poch-ven (like in German ‘bach’)
But I guess we have an official source for the correct pronunciation, this CCP video: https://www.youtube.com/watch?v=ygydAY22RYE (check at 2:14)
So if it’s pronounced ‘Posh-vahn’, why write it ‘Pochven’? Is it a word from a real language?