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Filter by region 

// BEGIN GenerateWP.com Snippet #a3d9 (http://bit.ly/about-snippet?g=wp_tax_query)
$region_query = array(
	array(
		'taxonomy'         => 'region',
		'terms'            => 'someregion',
		'field'            => 'slug',
	),
);
// END GenerateWP.com Snippet #a3d9 (http://bit.ly/about-snippet?g=wp_tax_query)