Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Gusuku Sites and Related Properties of the Kingdom of Ryukyu' has mentioned 'Stone' in the following places:
Occurrence Sentence Text Source
The nine component parts of the property include the sites and archaeological ruins of two stone monuments, five castles, and two cultural landscapes.
In the 10th-12th centuries, Ryukyuan farming communities (gusuku) began to enclose their villages with simple stone walls for protection.