"Hot springs are a friend to a chilled body. Welcome to Big Bull's beloved spa. Pos Pos Spa"
The Pospos Spa is a small outpost located by the entrans to the Transverse Tunnel in Pospos Snowfield. While not a full-fledged town, it does provide the amenities of one, sporting both an Inn and the Impressed Bather's shop.
Pospos Spa is a chalet style spa built by a natural hot spring. It's owned and lovingly run by Big Bull who presumably employs the Innkeep. Perhaps due to its remote location, the only residents Ari meets are the Innkeep, Impressed Bather, and Down to Earth Young Man.
Pospos Spa has no accessible locations aside from its foyer.