《礼记·王制》
名山大泽不作封地来用，剩下的土地，或者作为大诸侯国的附庸，或者作为闲田。
名山大泽不以封，其余以为附庸间田。
Famous mountains and big marshes should not be used as feudal domains. The remaining land may either be used as dependencies of large vassal states or as freeholder land.