Estimated around 4 million of them against south Lebanon:
https://imeu.org/resources/key-issues/quick-facts-israels-il...
https://www.hrw.org/report/2008/02/16/flooding-south-lebanon...
The map of countries which sign the convention against landmines is extremely obvious in that context.
Iran signed the human rights treaties ... and openly executes gays and minors. They boast about this publicly.
No such country exists. So long as enemies are likely to put boots, wheels, or tracks on the ground in your country, landmines are extremely useful, extremely cheap, and extremely effective.
Doubly so, since they understood themselves to be backed up by a non-signatory (the US).
They release the submunitions at much higher altitudes than they were intended so they spread across a much larger area and thus ineffective at hitting anything other than an urban target.
But on the plus side for the Iranians they separate outside of the interception envelope of even the exo atmospheric interceptors Israel has so they actually get through even if each sub munition is only a nuance at best.