Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ngorongoro Conservation Area' has mentioned 'Wall' in the following places:
Occurrence Sentence Text Source
The southern and eastern boundaries are approximately defined by the rim of the East African Rift wall, which also prevents animal migration in these directions.
The other major water source in the crater is the Ngoitokitok Spring, near the eastern crater wall.