The principal activity of the duchy is the management of its land holdings in England of 135,000 acres or 55,000 ha.[1] This includes 7,571 ha or 18,710 acres of land in Cornwall itself which comprises 13% of the whole Duchy estate.[3] Half of the estate is on Dartmoor in Devon, with other large holdings in Herefordshire, Somerset and almost all of the Isles of Scilly. The duchy also has a portfolio of financial investments.