CREATE TABLE table_32415 ("Basin" TEXT, "Continent" TEXT, "Drains to" TEXT, "Basin Area km 2" FLOAT, "Basin Area mi 2" TEXT)

Which Basin's Continent is South America, has a Basin Area km 2 larger than 6,144,727, and a Basin Area mi 2 of 238,539?
SELECT "Basin" FROM table_32415 WHERE "Continent" = 'south america' AND "Basin Area km 2" > '6,144,727' AND "Basin Area mi 2" = '238,539'
SELECT "Basin" FROM "table_32415" WHERE "Basin Area km 2" > '6,144,727' AND "Basin Area mi 2" = '238,539' AND "Continent" = 'south america'