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_25721_4 (region_1 VARCHAR, release VARCHAR)

### Question ###
How many region 1's did back to earth have?

### Accurate SQL ###

SELECT COUNT(region_1) FROM table_25721_4 WHERE release = "Back to Earth"