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_1672804_2 (region VARCHAR, province VARCHAR)

### Question ###
What is the region containing the Constitutional Province of Callao?

### Accurate SQL ###

SELECT region FROM table_1672804_2 WHERE province = "Constitutional province of Callao"