CREATE TABLE table_214920_1 (land_area VARCHAR, population_canada_2011_census VARCHAR)

What is the land area for the RCM that has a population of 18847?
SELECT land_area FROM table_214920_1 WHERE population_canada_2011_census = 18847
SELECT "land_area" FROM "table_214920_1" WHERE "population_canada_2011_census" = 18847