Constitution of Kenya – Chapter Eleven, Part Four

188. Boundaries of counties

(1)The boundaries of a county may be altered only by a resolution—
(a)recommended by an independent commission set up for that purpose by Parliament; and
(b)passed by—
(i)the National Assembly, with the support of at least two-thirds of all of the members of the Assembly; and
(ii)the Senate, with the support of at least two-thirds of all of the county delegations.
(2)The boundaries of a county may be altered to take into account—
(a)population density and demographic trends;
(b)physical and human infrastructure;
(c)historical and cultural ties;
(d)the cost of administration;
(e)the views of the communities affected;
(f)the objects of devolution of government; and
(g)geographical features.