How can menu tabs be relocated to another region?
"I cannot identify a block that contains them." There is not a block that contains these. In Drupal 7, these tabs are a variable called $tabs found in /modules/system/page.tpl.php.

You could suppress these tabs by overriding page.tpl.php in your theme.

To put them in another region, you could:


Implement hook_preprocess_page(&amp;$variables, $hook) in your theme's template.php or in a custom module.
Copy the contents of the $variables['tabs'] array key into another region.