เมืองใดใหญ่ที่สุดตามพื้นที่ ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
what city is the largest by surface area ?It is not neccessary to use all the tables.
 table_203_731:  id [ number]  "pos." [ text]  "city" [ text]  "population\n(ab)" [ number]  "surface\n(km2)" [ number]  "density\n(ab/km2)" [ number]  "altitude\n(mslm)" [ number] 
SELECT "city" FROM table_203_731 ORDER BY "surface\n(km2)" DESC LIMIT 1