Frost Bottom

Frost Bottom is an area introduced to Borderlands 2 in How Marcus Saved Mercenary Day. This region of Pandora is not directly accessible via Fast Travel. One must go to Marcus' Mercenary Shop, located near the edge of The Dust. Marcus has an unexplained portal through a wardrobe through which the characters can enter the area.

Gingerton
Gingerton is the main town in Frost bottom, located on the side of a mountain. The area has a decidedly traditional Christmas motif. The houses in town were designed to look like gingerbread houses and there are candy cane poles surrounding the tree in the center of town.

Frost Bottom Station
The train station resides on a hill overlooking Gingerton. It has a coal furnace which is used to heat the entire town.

Carol Corner
Carol Corner is an area on the hill south of Frost Bottom Station. As with the other areas outside of Gingerton, the buildings are of typical wood construction. Carol Corner is opposite the (frozen) river from Tinsel Waystation.

Tinsel Waystation
Tinsel Waystation contains the controls for the drawbridge which connects the railway from outside Frost Bottom to Gingerton. Bandits have seemingly taken over this area.

On Frozen Pond
On Frozen Pond is a frozen body of water north of Gingerton. Tinder Snowflake lives in the valley below the cliff where this pond sits.

Trivia

 * According to the developer walkthrough on IGN, Frost Bottom is located on "the southernmost tip of Pandora".
 * Players access Frost Bottom through a wardrobe, a reference to the C.S. Lewis series of novels The Chronicles of Narnia.
 * On Frozen Pond may be a reference to the American play and later film On Golden Pond.
 * According to Smaller-than-average Timothy, many of the inhabitants of Gingerton are ex-Slabs, the bandit gang run by Brick.