The altars, to wit, of burnt-offerings; because they are distinguished from the altars of incense here following; both which were removed and destroyed, partly because all the Israelites were confined to the altars of the temple, and partly because these altars were erected to idols.
Related Commentaries of 2 Chronicles 30:14
2 Chronicles 30:14
14 And they arose and took away the altars that were in Jerusalem, and all the altars for incense took they away, and cast them into the brook Kidron.