Winterspring

Winterspring (also known as Winterspring Valley) is a valley located in Northern Kalimdor, east of Felwood and Hyjal, and north of Azshara. It holds the goblin city of Everlook, old night elven holdings and the primary home of the blue dragonflight on Kalimdor. Many wild creatures roam this beautiful landscape.

One hundred of years before the events of World of Warcraft, a group of high elves left Quel'Thalas and traveled to Winterspring in order to obtain the Crystal of Zin-Malor.

Third War
During the events of Third War, Thrall's Horde, the Alliance remnants, the Scourge, the night elven Sentinels and the corrupted satyrs made camps here. Tyrande Whisperwind and Malfurion Stormrage destroyed a human camp and the satyrs and awakened the druids of talon in the Barrow Dens. At the same time, a death revenant cursed a glade, raising skeletons and ghosts in the area. Tyrande, Malfurion, and the Sentinels defeated him and the glade recovered.

World of Warcraft
Elementals invaded the area only to be fought by the adventurers of the Alliance and Horde.

The Burning Crusade
Prior to the start of the Invasion of Outland, Winterspring was invaded by a group of Burning Legion demons led by Highlord Kruul.

Wrath of the Lich King
The area was also invaded twice by the Scourge in the years leading to the war against the Lich King.

Adapted from WoWPedia