Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18425346_2 (city_area_km_2__ INTEGER)
### Question:
What is the smallest city area?
### Answer:
SELECT MIN(city_area_km_2__) FROM table_18425346_2