Abdullah bin Umar reported,

He narrated to him that the Messenger of Allah ﷺ stopped beside some tall trees to the left of the road, in a watercourse below Harsha. That watercourse adjoins the foothill of Harsha, and between it and the road is a distance of nearly a bowshot. Abdullah used to pray facing one of those trees, the one closest to the road and the tallest among them.

Bukhari 489

Sahih

وأن

عبد الله بن عمر

حدثه أن رسول الله ﷺ نزل عند سرحات عن يسار الطريق في مسيل دون هرشى ذلك المسيل لاصق بكراع هرشى بينه وبين الطريق قريب من غلوة وكان عبد الله يصلي إلى سرحة هي أقرب السرحات إلى الطريق وهي أطولهن

البخاري 489صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Prayer
Chapter
Mosques along the roads of Madinah, and the places where the Prophet ﷺ prayed
Numbering
Darussalam 489
Bukhari 489