Denaxi was an inhabited planet located near the Romulan Neutral Zone. It was a frigid world with snowy terrain, and experienced severe blizzards. It was the site of Denaxi Depot, a transportation hub overseen by the Xindi-Reptilians. (PRO: "Crossroads")
The planet's name was not stated onscreen, but was given by Aaron Waltke in a tweet. [1]