Her point is that many of us don't choose our place; our place chooses us. It's not so much a decision as a non-decision. A not-moving rather than a staying put.
What helped Knapp stay put is the Charles River, "one of the longest, best stretches of flat water for rowing anywhere in the U.S." and where Knapp would scull four or five times a week.
If we stay here (and it's always "if"), it will be because of the hollow tree along Little Difficult Run, the one Copper always has to stick his nose in on the days he's lucky enough to get a walk. It will be because of the mossy hill and the view of treetops I can see from there. It will be because of this one ancient knobby tree stump I always look for because more often than not it trips me up.
It will be the little things that keep us here.