haldini

This code appears to add Canary Islands to both front and backend. Testing still required but may help someone.

add_filter( 'woocommerce_countries', 'add_custom_country' );

function add_custom_country( $countries ) {
  $new_countries = array(
  'IC' => __( 'Canary Islands', 'woocommerce' ),
);

return array_merge( $countries, $new_countries );
}

add_filter( 'woocommerce_continents', 'add_custom_country_to_continents' );

function add_custom_country_to_continents( $continents ) {
  $continents['EU']['countries'][] = 'IC';
  return $continents;
}