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_68 (rank INTEGER, area VARCHAR, density VARCHAR, province VARCHAR)

### Question ###
What is the highest Rank with a density less than 376.37, the province was valverde, and an Area larger than 823?

### Accurate SQL ###

SELECT MAX(rank) FROM table_name_68 WHERE density < 376.37 AND province = "valverde" AND area > 823