The Shenandoah Valley battlefields NHA preserves sites from this war

The Rivers of Steel NHA flows through 8 counties in this state

The first NHA was the Illinois & Michigan Canal which in 1848 linked the Illinois River with this one that now gets dyed green

Atchafalaya NHA stretches over 14 of these Louisiana's equivalent of counties

The NHA website for this region of the Mississippi River describes it as the land where the blues began