Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25586 ( "Region ( NUTS 2006)" text, "Total (million \u20ac )" text, "\u20ac per capita (2005)" real, "PPP (million \u20ac)" real, "PPP \u20ac per capita" real, "% of EU average GDP (PPP)" text )

### Question ###
Where is the PPP 23164 million ?

### Accurate SQL ###

SELECT "Region ( NUTS 2006)" FROM table_25586 WHERE "PPP (million \u20ac)" = '23164'