Jetavana was one of the most famous of the Buddhist monasteries or viharas in India (present-day Uttar Pradesh). It was the second vihara donated to Gautama Buddha after the Venuvana in Rajgir.

Jetavana is located just outside the old city of Shravasti. There was also an important vihara named Jetavana in Sri Lanka. Sravasti is an ancient city that is located in the state of Uttar Pradesh. The place is also known as Savathi. The area is associated with Buddha for many reasons and it one of the main places of interest for many Buddhists in the region.

Jetavana was the place where the Buddha gave the majority of his teachings and discourses, having passed at Jetavana nineteen out of 45 vassas, more than in any other monastery. It is said that after the Migaramatupasada, a second vihara erected at Pubbarama, close to Shravasti, came into being. The Buddha would dwell alternately in Jetavana and Migaramatupasada, often spending the day in one and the night in the other. The Jetavana monastery at Shravasti is indeed one of the most holy places in Shravasti.

The remains of Lord Buddha’s hut can be seen at the monastery and it is covered with flowers by devotees. There is a Bodhi tree that is located in the monastery as well. Jetavana is currently a historical park, with remains of many ancient buildings such as monasteries, huts (such as the Gandhakuti and the Kosambakuti) and stupas. In Jetavana is also located the second-holiest tree of Buddhism: the Anandabodhi tree. A visit to Savathi and Jetavana is part of the Buddhist pilgrim route in north-India. The most revered place in Jetavana is Gandhakuti, where Buddha used to stay.

Source:

https://en.wikipedia.org/wiki/Jetavana

https://www.placeforvacations.com/jetavana-monastery-shravasti-in-uttar-pradesh

http://aniccasight.blogspot.com/2014/05/legends-of-jetavana-gardens-sravasti.html