At the site where he -the Spirit Jibril- took Up his station - Surah An-Najm ayat 14 in Tafsir

﴿عِندَ سِدۡرَةِ ٱلۡمُنتَهَىٰ ﴾
[النَّجم: 14]

At the site where he -the Spirit Jibril- took Up his station in the realm of heaven, a site designated " Sidrat Al Montaha "; (interpreted to be the boundary fenced by trees, where no one, spiritual or otherwise can ascend or descend beyond, unless ordained by Allah)

﴿عند سدرة المنتهى﴾ [النَّجم: 14]

Dr Kamal Omar
close to Sidrat-ul-muntaha (lote-tree that demarcates the limits or the borders)

Dr Laleh Bakhtiar
near the Lote Tree of the Utmost Boundary

Dr Munir Munshey
Near the farthest bound of the Lotus tree

Edward Henry Palmer
by the lote tree none may pass

Farook Malik
near Sidra-tul-Muntaha (the Lote-tree at the farthest end of the seven heavens, beyond which none can pass)

George Sale
by the lote-tree beyond which there is no passing

Maududi
by the lote-tree at the farthest boundary