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_23685890_2 (est VARCHAR, land_area__km²_ VARCHAR)

### Question ###
On what year was the local government area with a surface of 4563 square kilometers established?

### Accurate SQL ###

SELECT est FROM table_23685890_2 WHERE land_area__km²_ = "4563"