Rural- relating to, or characteristic of the country side rather than the town. For a more simple definition it's basically people who live out in the country side. Example- She lives in a rural area.
Coastal plains and Interior plains is in elevation. Coastal plains have low elevation and low relief. Interior plains have varied elevation and low relief. Coastal plains also lie along the shore while Interior plains are surrounded by other hopefully this helps
A river is not considered wetland. Wetlands are muddy areas with no distinguishable waterflow, usually
