Since this is the first google result, probably where you got your definition (that’s not a dig, that’s my level of understanding).
"Also, marshes are typically not as deep as swamps."
Which is basically what I said 
Swamps tend to have deeper water and channels from what I understand, formed around the trees, water-covered land with no trees and no channels is… a lake.
I’m most certainly oversimplifying, I was just noting the differences I’ve observed between the marshes I’ve seen in Wisconsin and the swamps I was more familliar with down south. shrug
Definitionally, DDA swamps have trees, and are therefore swamps I guess, but as for how you navigate, they’re more like marshes, so it’s kind of a wash. Maybe ditch the trees? 