  The axion provides a compelling solution to the strong CP problem as well as
a candidate for the dark matter of the universe. However, the axion solution
relies on the spontaneous breaking of a global $U(1)_{PQ}$ symmetry, which is
also explicitly violated by quantum gravity. To preserve the axion solution,
gravitational violations of the $U(1)_{PQ}$ symmetry must be suppressed to
sufficiently high order. We present a simple, geometric solution of the axion
quality problem by modelling the axion with a bulk complex scalar field in a
slice of AdS$_5$, where the $U(1)_{PQ}$ symmetry is spontaneously broken in the
bulk but explicitly broken on the UV brane. By localising the axion field
towards the IR brane, gravitational violations of the PQ symmetry on the UV
brane are sufficiently sequestered. This geometric solution is holographically
dual to 4D strong dynamics where the global $U(1)_{PQ}$ is an accidental
symmetry to sufficiently high order.
