The forging and hoarding of the Sampo and its abundance by the witch Louhi inside a great mountain in the dark reaches of Pohjola; the struggle and war by the people of the south to free the Sampo and capture it for their own needs and the subsequent shattering of the Sampo and the loss of its all-important lid (which implies the breaking of the world tree at the north pole) together constitute the bulk of the Kalevala material.