Table schema:
CREATE TABLE table_name_12 (country VARCHAR, mountain VARCHAR, range VARCHAR, prominence__m_ VARCHAR, height__m_ VARCHAR)

Question: Which Country has a Prominence (m) smaller than 1540, and a Height (m) smaller than 3530, and a Range of virunga mountains, and a Mountain of nyiragongo?
SQL: SELECT country FROM table_name_12 WHERE prominence__m_ < 1540 AND height__m_ < 3530 AND range = "virunga mountains" AND mountain = "nyiragongo"