public function delete( &$zone, $args = array() ) {
		$zone_id = $zone->get_id();

		if ( $zone_id ) {
			global $wpdb;

			// Delete methods and their settings.
			$methods = $this->get_methods( $zone_id, false );

			if ( $methods ) {
				foreach ( $methods as $method ) {
					$this->delete_method( $method->instance_id );
				}
			}

			// Delete zone.
			$wpdb->delete( $wpdb->prefix . 'woocommerce_shipping_zone_locations', array( 'zone_id' => $zone_id ) );
			$wpdb->delete( $wpdb->prefix . 'woocommerce_shipping_zones', array( 'zone_id' => $zone_id ) );

			$zone->set_id( null );

			WC_Cache_Helper::invalidate_cache_group( 'shipping_zones' );
			WC_Cache_Helper::get_transient_version( 'shipping', true );

			do_action( 'woocommerce_delete_shipping_zone', $zone_id );
		}
	}