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_name_75 (area_km_2 INTEGER, official_name VARCHAR)
### Question:
Can you tell me the sum of Area km 2 that has the Official Name of glenelg?
### Answer:
SELECT SUM(area_km_2) FROM table_name_75 WHERE official_name = "glenelg"