CREATE TABLE table_17584 ("Rank" FLOAT, "Peak" TEXT, "Elevation  ( m ) " FLOAT, "Prominence  ( m ) " FLOAT, "Isolation  ( km ) " FLOAT, "Municipality" TEXT, "County" TEXT)

What county is in isolation of 29?
SELECT "County" FROM table_17584 WHERE "Isolation (km)" = '29'
SELECT "County" FROM "table_17584" WHERE "Isolation (km)" = '29'