What is the total area of drakenstein and a population less than 251,262?
CREATE TABLE "geography" (
  "name" text,
  "seat" text,
  "population_2011" real,
  "area_km_2" real,
  "density_inhabitants_km_2" real
);
SELECT COUNT("area_km_2") FROM "geography" WHERE "name"='drakenstein' AND "population_2011"<'251,262';