SELECT region_name FROM region ORDER BY region_name
What are the names of the regions in alphabetical order?
[Schema (values) (types)]: | storm_record |  storm : storm_id (text) , name (number) , dates_active (text) , max_speed (text) , damage_millions_usd (number) , number_deaths (number) | region : region_id (text) , region_code (number) , region_name (text) | affected_region : region_id (text) , storm_id (number) , number_city_affected (text);