CREATE TABLE table_30121046_1 (area__acres__ INT, townland VARCHAR)

What is the maximum area (in acres) of the Knockacullen townland?
SELECT MAX(area__acres__) FROM table_30121046_1 WHERE townland = "Knockacullen"
SELECT MAX("area__acres__") FROM "table_30121046_1" WHERE "Knockacullen" = "townland"