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_19242_5 (_km² VARCHAR, of_which_currently_forests INTEGER, land_formation VARCHAR)

### Question ###
When middle prut valley is the land formation what is the highest of which currently forests, km² ?

### Accurate SQL ###

SELECT MAX(of_which_currently_forests), _km² FROM table_19242_5 WHERE land_formation = "Middle Prut Valley"