A bog is a wetland that receives water from

A bog is a wetland fed only by rainfall, which leaves it nutrient-poor and acidic.

Drawing water from nearby water bodies describes fens or marshes rather than a bog.

Melting ice is not the defining water source of a bog.

Seawater does not feed a bog, which is a freshwater peat-forming system.

Rain dependence leaves bogs low in minerals and rich in accumulated peat.

Bogs store large amounts of carbon in their thick peat layers.