Matanuska-Susitna Valley Geology The Matanuska-Susitna Valley has been perfectly carved over thousands of years to frame glaciers, mountains, and rivers, and to serve as an entrance to exploration. This valley is located in the southeastern region of Alaska, dipping into the Interior. You’ll pass giant peaks etched away and dropping into cliffs that meet the river basin. Accessing the geological wonders this valley has to offer is as easy [...]