From WoWWiki:
The Grizzly Hills, located in south-eastern Northrend, is the home ground of the Grizzlemaw furbolgs. The dwarven settlement of Thor Modan can be found in the north, as well as the Scourge fortress of Drak'Tharon Keep. Over 20,000 furbolgs live in the Grizzly Hills, most in the large settlement of Grizzlemaw.
It is similar to other forests during wintertime, except that winter here is year-round. The trees are tall and thick, the pine needles and crisp, clean air produce a pleasant scent, the snow leaves the ground clean and fresh, and the hills themselves are high enough for decent elevation but low enough and gradual enough to be easily climbed. It’s one of the nicest regions in Northrend. Dwarves live here at Thor Modan, but they aren’t the only residents. Furbolgs dominate the region, and they make are fine neighbors when they’re not attacking. The Scourge has a presence here as well, but not strong enough to do much more than block the northwest corner. Wild animals roam the hills, providing plenty of meat and fur and entertainment. It’s not an easy land by any stretch, but it’s handsome and fierce and full of life.
It has also been revealed that the Venture Co. will be found here, deforesting the land. The deforesting operation is large-scale and throughout the region. Arugal has also been resurrected and now leads his worgen army in Grizzly Hills. Some Furbolgs have also been corrupted by an Old God.
The Grizzly Hills are as hilly as the name suggests. Along the northern edges the land gains height and depth, approaching the level of small mountain ranges, while it flattens out a little in the south. Thick forest covers the land from end to end, broken only by small clearings or the space alongside one of the many streams and small rivers. Snow is everywhere but the region has little ice — the wind whistles overhead but the trees block it from entering down below, and the hills seem almost warm compared to the Dragonblight and the Borean Tundra. It’s still dangerous, with treacherous slopes and hidden caves and partially frozen rivers, but better than most of the other regions. All manner of wild animals live in the area, and the hills are full of life. Wolves, bears, foxes, rabbits and some small deer are the most common. Mice and other rodents hide from the snowy owls and other raptors in the trees, but mercifully snakes and spiders aren’t present here, likely due to the temperature. Wendigo and sasquatch prowl the hills, so it’s best not to go out alone. The Drakkari live just north in Zul’Drak and sometimes their hunters drift down to the hills as well, in search of prey.
The Grizzly Hills have three major settlements, each controlled by a different race. It’s strange that all three coexist here, and even stranger that they’re all along the north edge. The southern hills have other furbolg tribes and the random trapper or traveler, but nothing larger than a small village.