CREATE TABLE table_73310 ("Regional County Municipality  ( RCM ) " TEXT, "Population Canada 2011 Census" FLOAT, "Land Area" TEXT, "Density  ( pop. per km2 ) " TEXT, "Seat of RCM" TEXT)

What is the land area for the RCM that has a population of 18847?
SELECT "Land Area" FROM table_73310 WHERE "Population Canada 2011 Census" = '18847'
SELECT "Land Area" FROM "table_73310" WHERE "Population Canada 2011 Census" = '18847'