Assertion: range's mountain | /r/CapableOf | begin as foothill
Facets:
value: in the east
type: LOCATION
Source sentences:
text: In the east the mountains begin as foothills forming the western edge of the Willamette Valley and continue west to the coastline and beyond where the basalt formation tapers off into the continental shelf and ends at the continental slope with several banks and basins off shore.