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_2801442_1 (area__km²_ INTEGER, code VARCHAR)
### Question:
How big (in km2) is the district with a code BW?
### Answer:
SELECT MIN(area__km²_) FROM table_2801442_1 WHERE code = "BW"