Treasure Map XXV is found to the east of Rattay in the Broken Wheel Inn's cellar, near where Henry trains with Captain Bernard. However, the treasure itself is a long way away to the east of Skalitz.

With Treasure Map 25 done and dusted, that's all of the hidden treasure sets done in Kingdom Come: Deliverance - congrats on your treasure hunting, and enjoy your new, and rather overpowered gear!