The wall should be widest at the base and will taper toward the top. This is true if it is a freestanding wall or a retaining wall. In the case of a retaining wall it is especially important to have the face of the wall leaning in toward the hillside. This is called the wall's "batter."

Happy stacking!

Building a dry stacked wall to run along a driveway. It will only be 20" high but it's on an incline. Most of what I read says to create steps when building on an incline but this is 200' long and about 25% incline so it would be stepped almost every 5 feet to maintain level and still have 20" hieight.
Is it required to step or can a dry stacked low wall just sit in the natural incline?