A hidden region is a new feature in drupal 7. I was modifying a drupal 7 theme. In the .info file I found two regions - 'page_top' and 'page_bottom'. I wanted to assign some blocks to those regions. But surprisingly I couldn’t find them in block administration area. After some searching I came to know about the feature – hidden region.  It's a way to define regions that are available for modules but are not available in the blocks administration area.

By default  'page_top' and 'page_bottom' are hidden regions.  More hidden regions can be added via the regions_hidden[] .info file array.

http://pingv.com/blog/a-peek-at-drupal-7-theme-system-changes

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