وَالْحَوْضُ حَقٌّ
The basin is real.
The Qur'an states: إِنَّا أَعْطَيْنَاكَ الْكَوْثَرَ (108:1). Kawthar conveys abundant good, and Prophetic reports further describe a river and the basin. The word alone does not provide every detail of the basin; the narrations supply the relevant particular descriptions.
A general scriptural affirmation and specific transmitted descriptions serve complementary functions. They should not be conflated.