Custom theme region for page
Use the following code:

/**
 * Implements hook_preprocess_region().
 */
function YOURTHEME_preprocess_region(&amp;$vars) {
  // Make sure we are on a single node page
  // This code will allow you to add the following templates for regions:
  // region--node-NID.tpl.php
  // You can update the conditions to anything you want and rename the template
  // suggestions.
  if (arg(0) == 'node' &amp;&amp; is_numeric(arg(1)) &amp;&amp; !arg(2)) {
    $vars['theme_hook_suggestions'][] = 'region__node_' . arg(1);
  }
}