That banyan tree was eight hundred miles high, and its branches spread over six hundred miles around. The tree cast a fine shade which permanently cooled the temperature, yet there was no noise of birds.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स योजनशतोत्सेधः पादोनविटपायतः । पर्यक्कृताचलच्छायो निर्नीडस्तापवर्जितः
sa yojanaśatotsedhaḥ pādonaviṭapāyataḥ | paryakkṛtācalacchāyo nirnīḍastāpavarjitaḥ
SB 4.6.32