question: What is the greatest area when the Poor Law Union is Skibbereen and the Civil Parish is Tullagh?
answer: SELECT MAX(area__acres__) FROM table_30121082_1 WHERE poor_law_union = "Skibbereen" AND civil_parish = "Tullagh"
context: CREATE TABLE table_30121082_1 (area__acres__ INTEGER, poor_law_union VARCHAR, civil_parish VARCHAR)