Occurrence of Attributes in Original Text

The text related to the cultural heritage 'State Historical and Cultural Park “Ancient Merv”' has mentioned 'Citadel' in the following places:
Occurrence Sentence Text Source
Erk Gala (from Persian, "the citadel fort") is the oldest part of the city of Merv complex.
Many of these are concentrated in Soltangala's citadel, the Shahryar Ark (Persian, "the Sovereign's citadel") of the, located on its east side.
Erk Kala (20ha), is a walled and moated polygonal site with walls surviving to some 30 m and an internal citadel.
The walls (12 km) of the medieval city and of the citadel (Shahriyar Ark) are unique and represent two consecutive periods of 11th-13th centuries military architecture, including towers, posterns, stairways, galleries, and in places, crenellation.