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_46 ( area_km_2 INTEGER, official_name VARCHAR )

### Question ###
Notre-Dame-De-Lourdes has what average area km 2?

### Accurate SQL ###

SELECT AVG(area_km_2) FROM table_name_46 WHERE official_name = "notre-dame-de-lourdes"