If the headquarters is Bharatpur, what is the maximum area?
CREATE TABLE "table1_2168295_1" (
  "district" text,
  "headquarters" text,
  "area_km" real,
  "population_2011" real,
  "division" text
);
SELECT MAX("area_km") FROM "table1_2168295_1" WHERE "headquarters"='Bharatpur';