Sahih al-Bukhari 487

Abdullah bin Umar told him that the Prophet (ﷺ) used to alight beneath a huge Sarha tree before Ar-Ruwaitha, on the right side of the road and facing it, in a broad, level place where the road emerged from a hillock about two miles before the post-station of Ar-Ruwaitha. The upper part of the tree had broken and bent inward into its hollow, though it remained standing upon its trunk; and around its trunk were many heaps of sand.