on the confines of

References in classic literature ?
Creon desires to bury Oedipus on the confines of Thebes so as to avoid the pollution and yet offer due rites at his tomb.
On the confines of its geographical range, a change of constitution with respect to climate would clearly be an advantage to our plant; but we have reason to believe that only a few plants or animals range so far, that they are destroyed by the rigour of the climate alone.