CREATE TABLE table_18600760_12 (geo_id INT, land___sqmi__ VARCHAR)

What is the geo id of the land at 35.999?
SELECT MAX(geo_id) FROM table_18600760_12 WHERE land___sqmi__ = "35.999"
SELECT MAX("geo_id") FROM "table_18600760_12" WHERE "35.999" = "land___sqmi__"