Gharjestan (also Gharchestan, Gharshistan, Gharchegan, Garshestan) was historical region comprising large mountainous land located between Herat and Kabul. The area comprised the lands later known as Hazarajat.
Gharjistan was originally known as "Garshestan", derived from the Avestan word "Garsh" and the Persian suffix "stan". It was later Arabized to "Gharjistan". The Avestan word "Gar" meant "mountain", and was mentioned in the Yasna. The word "Giro" in Hazaragi is widely used in the mountainous regions of Gharjistan.