CREATE TABLE table_204_704 (id DECIMAL, "province" TEXT, "map #" DECIMAL, "iso 3166-2:af" TEXT, "centers" TEXT, "population" DECIMAL, "area  ( km2 ) " DECIMAL, "language" TEXT, "notes" TEXT, "u.n. region" TEXT)

give the province with the least population
SELECT "province" FROM table_204_704 ORDER BY "population" LIMIT 1
SELECT "province" FROM "table_204_704" ORDER BY "population" NULLS FIRST LIMIT 1