大唐西域記 4.54

4.54

城外龍池側有窣堵波，無憂王之所建也。是如來在昔為龍王，七日於此說法。其側有四小窣堵波，是過去四佛坐及經行遺迹之所。自此東行二百六七十里，渡殑伽河，南至毘羅那拏國（中印度境）。

This country is about 3000 li in circuit, and the capital about 17 or 18 li. It is naturally strong, being flanked by mountain crags. It produces wheat, and there are many woods and fountains. The climate is soft and agreeable, and the people sincere and truthful. They love religion, and apply themselves to learning. They are clever and well informed. There are about ten sanghārāmas, and some 1000 priests who study the Little Vehicle of the Ching-liang school.
There are some nine Deva temples with 300 sectaries. They sacrifice to Īśvara, and belong to the company of "ashes-sprinklers" (Pāśupatas).
Outside the chief town is a Nāga tank, by the side of which is a stūpa built by Aśōka-rāja. It was here the Tathagata, when in the world, preached the law for the sake of a Naga-raja for seven days. By the side of it are four little st-upas ; here are traces where, in days gone by, the four past Buddhas sat and walked.
From this going south 260 or 270 li, and crossing the river, proceeding then in a south-west direction, we come to Pi-lo-shan-na (Virasana) country.