original_query: What is a fen and how is it different from other types of wetlands?
query: What is a fen and how is it different from other types of wetlands?
answer: A fen is a type of peat-accumulating wetland fed by mineral-rich ground or surface water.  Unlike bogs, which are primarily fed by rainwater, fens have higher mineral concentrations and a more basic pH.  Fens are one of the main types of wetlands, along with marshes, swamps, and bogs.