Table: provinces_peru
Columns: province
population
region
name_of_city
districts

Question: What is the region where Iquitos is located?
SQL: SELECT "region" FROM provinces_peru WHERE "name_of_city" = 'Iquitos'

Question: What is the region containing the Constitutional Province of Callao?
SQL: SELECT "region" FROM provinces_peru WHERE "province" = 'Constitutional Province of Callao'