CREATE TABLE table_204_143 (id DECIMAL, "national park" TEXT, "region" TEXT, "land area  ( km2 ) " DECIMAL, "established" DECIMAL, "visitation  ( 2009 ) " DECIMAL, "coordinates" TEXT)

which park has the least land area ?
SELECT "national park" FROM table_204_143 ORDER BY "land area (km2)" LIMIT 1
SELECT "national park" FROM "table_204_143" ORDER BY "land area (km2)" NULLS FIRST LIMIT 1