  We consider the superposition of infinitely many instantons on a circle in
R^4. The construction yields a self-dual solution of the Yang-Mills equations
with action density concentrated on the ring. We show that this configuration
is reducible in which case magnetic charge can be defined in a gauge invariant
way. Indeed, we find a unit charge monopole (worldline) on the ring. This is an
analytic example of the correlation between monopoles and action/topological
density, however with infinite action. We show that both the Maximal Abelian
Gauge and the Laplacian Abelian Gauge detect the monopole, while the Polyakov
gauge does not. We discuss the implications of this configuration.
