Al-Matalib al-'Aliyah 4612 — The description of Paradise

It is narrated from Masruq (may Allah have mercy on him) that, about the "Gardens of Eden" [Surah al-Tawbah: 72] mentioned in the speech of Allah Almighty, he said: "It is the butnan of Paradise." I asked what is meant by the "butnan" of Paradise, and Sulayman explained: "It means the middle of Paradise (that is, its central, midmost and very best part)."
Imam Musaddad bin Musarhad recorded it in his Musnad; all its narrators are thiqat (trustworthy) and this narration is sahih (authentic) in its chain; Imam al-Bukhari also mentioned it in Sahih al-Bukhari in mu'allaq form (without a connected chain).