Find the names of the regions which were affected by the storm that killed the greatest number of people.
SELECT T2.region_name FROM affected_region AS T1 JOIN region AS T2 ON T1.region_id  =  T2.region_id JOIN storm AS T3 ON T1.storm_id  =  T3.storm_id ORDER BY T3.Number_Deaths DESC LIMIT 1
regions affected by the storm = JOIN operation between affected_region and region tables; greatest number of people killed by the storm = ORDER BY Number_Deaths DESC; names of the regions = SELECT region_name;