ěsteng province, like most provinces in the eastern half of Akurheim was once a large collection of small kingdoms or independant cities. It is roughly triangular shaped with its northern border following the Fehr river and the southern border being the edge of Gaedswolde. Its capital is ěst Tarn, the largest and oldest of the original states.
Era I, chapter 168 : Vardissa believes Unnhild might be in ěsteng, where another secret site might exist. Era I, chapter 170 : Normal life in Alt Traer is interrupted when demons are seen. Era I, chapter 171 : Vardissa believes the final devourer is located near ěsteng Province.