Question

What are the major land features that are usually present for a swamp to occur

Answer 1

The major land features that are usually present for a swamp to occur is Flat, poorly drained land.  Swamps are characterized by mineral soils with poor drainage and by plant life dominated by trees, It characterized also  by slow-moving to stagnant waters.

Answer 2

The major land features of a swamp is a wetland that is forested and inundated with shallow freshwater. Other swamps have dry-land protrusions or hammocks covered with grass, aquatic vegetation and trees (usually mangroves), which is damp all the time because they are just along large rivers or shores of large lakes.