Provide the account ID, district and region for loan amount greater than USD300,000.
A2 contains district names and A3 contains region names.
SELECT T1.account_id, T2.A2, T2.A3 FROM account AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id INNER JOIN loan AS T3 ON T1.account_id = T3.account_id WHERE T3.amount > 300000