Dictionary.com
Thesaurus.com

six-finger country

British  

noun

  1. slang  an isolated area considered as being inhabited by people who practise inbreeding

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012