1. an area of low-lying land that is flooded in wet seasons or at high tide, and typically remains waterlogged at all times

Examples

• The salt marsh was home to many species of birds.
• We walked carefully through the marsh, trying not to sink into the mud.
• The developers wanted to drain the marsh to build houses.
• Cattails and reeds grew thick in the freshwater marsh.
• The marsh provided important flood protection for the town.
• Scientists studied the ecosystem of the coastal marsh.