Findings

The project found that:

• woods that could be classified with any degree of certainty as ancient were many times scarcer in Northern Ireland than in the rest of the UK, covering only 0.04 per cent of Northern Ireland's land area

• More than one-eighth of ancient and long-established woodland has been cleared in the last 40 years

• Around a third of ancient woods have been replanted with conifers, or a mixture of conifers and broadleaves

The interactive map shows areas that were surveyed, and how they were classified.