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_name_16 ( circuit VARCHAR, fastest_lap VARCHAR, race VARCHAR )

### Question ###
What circuit did Juan Manuel Fangio have the fastest lap at the german grand prix?

### Accurate SQL ###

SELECT circuit FROM table_name_16 WHERE fastest_lap = "juan manuel fangio" AND race = "german grand prix"