Peat bog
A wetland of slowly decaying plant matter — soft ground that preserves what falls into it for centuries.
A peat bog in a dream is the dream's image of soft ground that preserves what falls into it for centuries. The bog is acidic, low in oxygen, and cold; the things that go into it do not rot, they wait. The dream brings the peat bog when something in your life — an old grievance, a preserved memory, a buried family fact — is being kept in a condition where ordinary forgetting will not work on it, and what was put down years ago is still recognisable. A peat bog walked over with respect for what is preserved beneath is the dream affirming the kept depth. A peat bog cut for fuel, with old preserved objects coming to light, is the dream noting that the long preservation is being broken open, and what was waiting in the ground is now visible to the present.