WONDER - Holkham's sustainability and conservation action plan. Holkham is a 25,000 acre rural estate in north Norfolk in the UK, comprised of a plethora of landscapes rich in wildlife and biodiversity. From the coastal Holkham National Nature Reserve to farming, forestry to a thriving leisure business, Holkham is committed to pioneering environmental gain, championing low carbon living and treading lightly to stamp out waste.