CREATE TABLE table_46968 ("Municipality" TEXT, "Population" FLOAT, "Inhabitants per km\\u00b2" FLOAT, "Area  ( in km\\u00b2 ) " FLOAT, "Markatal" FLOAT, "Island" TEXT, "Region" TEXT)

What is the average Area (in km ), when Markatal is less than 0?
SELECT AVG("Area (in km\u00b2)") FROM table_46968 WHERE "Markatal" < '0'
SELECT AVG("Area (in km\u00b2)") FROM "table_46968" WHERE "Markatal" < '0'