Eastern Heartlands

The Eastern Heartlands, sometimes merely called the Heartlands, and Vesperin. was a vast region in central and northern Faerûn that comprised various smaller regions, nations and city-states, including the Dragon Coast, Cormyr, Sembia, Cormanthyr, the Dalelands, the southern stretch of the Moonsea, and Vesperin.

History
War engulfed much of the Eastern Heartlands during the 15 century DR, when lost flying city of Thultanthar appeared over the Anauroch desert and signaled the return of the Netheril empire. The conquering Netherese subjugated the nation of Sembia and some of the Dalelands, while engaging in a decades-long war with Cormyr and the renewed city of Myth Drannor that continued until the calamity known as the Second Sundering

Inhabitants
Far-reaching and influential groups operated throughout the cities and rural areas of the Eastern Heartlands, including the Harpers, the Zhentarim, and to a lesser degree the Red Wizards of Thay, colloquially known as the "Red Magic Cult."