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_16577990_1 (size_in_km² INTEGER, central_forest_reserve VARCHAR)
### Question:
What is the size of Itwara central forest reserve?
### Answer:
SELECT MIN(size_in_km²) FROM table_16577990_1 WHERE central_forest_reserve = "Itwara"