'ZM' => array( // Zambia's Provinces. Ref: https://en.wikipedia.org/wiki/ISO_3166-2:ZM.
        'ZM-01' => __( 'Western', 'woocommerce' ),
        'ZM-02' => __( 'Central', 'woocommerce' ),
        'ZM-03' => __( 'Eastern', 'woocommerce' ),
        'ZM-04' => __( 'Luapula', 'woocommerce' ),