Only some 3% of the land of Papua New Guinea is in private hands; this is privately held under 99-year state lease, or it is held by the State. There is virtually no freehold title; the few existing freeholds are automatically converted to state lease when they are transferred between vendor and purchaser. Unalienated land is owned under customary title by traditional landowners. The precise nature of the seisin varies from one culture to another. Many writers portray land as in the communal ownership of traditional clans; however, closer studies usually show that the smallest portions of land whose ownership cannot be further divided are held by the individual heads of extended families and their descendants or their descendants alone if they have recently died.