Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Trang An Landscape Complex' has mentioned 'Sea' in the following places:
Occurrence Sentence Text Source
The area is unique in having been invaded by the sea several times in the recent geological past but is now emergent on land.
The long cultural history is closely associated with geological evolution of the Trang An limestone massif in late Pleistocene and early Holocene times, when the inhabitants endured some of the most turbulent climatic and environmental changes in Earth history, including repeated submergence of the landscape due to oscillating sea levels.
Former inundation by the sea transformed the massif into an archipelago for some periods, though it is fully emergent on land today.