Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Monuments Zone of Tlacotalpan' has mentioned 'Island' in the following places:
Occurrence Sentence Text Source
The town was established in 1550 on what was originally an island in the Papaloapan River.
Early colonial era map showing Tlacotalpan as an island at the Salvador Ferrando Museum
This refers to the island of the original settlement in the Papaloapan River.
[2][4] When the north bank of the river was modified, the island was adjoined to the mainland.