THE HUMAN BODY
'(<a href="http://www.j-archive.com/media/2011-10-03_J_19.jpg" target="_blank">Sarah of the Clue Crew presents the clue on a monitor.</a>)  The thyroid gland has two lobes that are connected by a bridge of tissue called this, also a geographic term for a similar-looking narrow strip of land'
an isthmus