The map of Septentria, the region of the Pokémon Scarlet and Violet Turquoise Mask DLC
The first volume of DLC The Buried Treasure of the Zero Zone, entitled Turquoise Maskintroduces a brand new region in Pokémon Scarlet and Violet. Between the orienteering race, the Festival of Masks and the hunt for Adoramis, a map of Septentria will help you find your way in this unfamiliar territory.
Map of Septentria

How do I change my card?
First and foremost, you must get the Septentria mapAnd to do so, there's no choice but to go there. Go to the Main Hall of Paldea Academy to start your school trip.
You need to talk to Mrs Briaa teacher at Académie Myrtille. She's easily recognisable by her red and purple outfit. After your exchange, you will be transported directly to your destination. When you're there, you can open both the Paldea and Septentria maps. Of course, you can't access them at the same time.
To switch from one to the other, simply Open the map menu with the Y button and use the L and R buttons to select the desired map. Note that you can move from one region to another using fast travel points.