Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Monumental Earthworks of Poverty Point' has mentioned 'Valley' in the following places:
Occurrence Sentence Text Source
This article is about the U.S. National Monument and Louisiana state historic site in the lower Mississippi valley.
The people identified with the Poverty Point culture developed a distinct set of cultural traits different from other contemporary inhabitants in the Lower Mississippi Valley.
The site is located on the eastern edge of an elevated landform, Macon Ridge, in the Lower Mississippi Valley.
Criterion (iii): Poverty Point Monumental Earthworks bear exceptional testimony to a vanished cultural tradition, the Poverty Point culture, centred in the Lower Mississippi Valley during the Late Archaic period, 4,000-2,500 years ago.
The location provided easy access to the Mississippi River valley and the hardwood forests along its margins.