What's the adjective for cantonal? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs canton, cantonise and cantonize which may be used as adjectives within certain contexts.
cantoned
(heraldry) Having a charge in each of the four corners; said of a cross on a shield, and also of the shield itself.
(architecture) Having the angles marked by, or decorated with, projecting mouldings or small columns.