Name the least area 
CREATE TABLE "table1_24574438_1" (
  "ds_division" text,
  "main_town" text,
  "gn_divisions" real,
  "area_km_2" real,
  "sri_lankan_tamil" real,
  "sri_lankan_moors" real,
  "sinhalese" real,
  "indian_tamil" real,
  "other" real,
  "total" real,
  "population_density_km_2" real
);
SELECT MIN("area_km_2") FROM "table1_24574438_1";