Question: Where did Kauṇḍinya, a Buddhist monk study?
Context: Faxian (; 337 – c. 422) was a Chinese Buddhist monk who travelled by foot from China to India, visiting many sacred Buddhist sites in what are now Xinjiang, Pakistan, India, Nepal, Bangladesh and Sri Lanka between 399-412 to acquire Buddhist texts.  His journey is described in his important travelogue, "A Record of Buddhist Kingdoms, Being an Account by the Chinese Monk Fa-Xian of his Travels in India and Ceylon in Search of the Buddhist Books of Discipline".  Antiquated transliterations of his name include Fa-Hien and Fa-hsien. Gautama Buddha (c. 563 BCE/480 BCE – c. 483 BCE/400 BCE), also known as Siddhārtha Gautama ] , Shakyamuni Buddha ] , or simply the Buddha, after the title of "Buddha", was an ascetic (śramaṇa) and sage, on whose teachings Buddhism was founded.  He is believed to have lived and taught mostly in the eastern part of ancient India sometime between the sixth and fourth centuries BCE. Śīlabhadra (Sanskrit; : "Jièxián" ) (529–645) was a Buddhist monk and philosopher.  He is best known as being an abbot of Nālandā monastery in India, as being an expert on Yogācāra teachings, and for being the personal tutor of the Chinese Buddhist monk Xuanzang. Song Yun () was a Chinese Buddhist monk who was sent by the devout Buddhist Empress Hu (胡 , ? -528 CE) of the Northern Wei Dynasty with some companions including the monk Hui Zheng, Fa Li and Zheng (or Wang) Fouze, to northwestern India to search for Buddhist texts.  They left the Wei capital Luoyang, on foot in 518 and returned in the winter of 522 with 170 Mahayana Buddhist texts. Ikkyū-san(一休さん) is a little Buddhist monk who is smart and playful like other children.  He often outsmarts adults.  The animation based on the historical Zen Buddhist monk Ikkyū that follows his mischievous adventures as a child during his stay at Ankoku-ji Temple.  In each episode, Ikkyū relies on his intelligence and wit to solve all types of problems, from distraught farmers to greedy merchants. Ximing Temple () was a famous temple in Chang'an, the capital of the Tang dynasty in Chinese history.  Chang'an, current day Xi'an, was the eastern terminus of the Silk Road, and a cosmopolitan metropolis.  Ximing was established by Tang Gaozong in 656.  It was at Ximing that pilgrim and traveller Xuanzang (602-664) had translated the scriptures he had brought back from India.  Another traveller Yijing (635-713) also based himself at Ximing while working on translations of Indian scriptures.  Indian scholar monk Shubhākarasimha, was responsible for the introduction of the Mahavairocana Sutra and the tantric traditions associated with it.  Japanese monk, Kukai studied Sanskrit there under the tutelage of Gandharan pandit Prajñā (734-810?)  who had been educated at the Indian Buddhist university at Nalanda.  Ximing was celebrated for its library which was the most comprehensive library of Buddhist texts in China at the time.  Woncheuk (613–696) (Chinese Yuáncè) was a Korean Buddhist monk, also known as Ximing Fashi (西明法师) after the name of this temple where he did most of his important work. Enni Ben'en (圓爾辯圓; Chinese Yuan'er Bianyuan; 1202–1280) was a Japanese Buddhist monk.  He started his Buddhist training as a Tendai monk.  While he was studying with Eisai, a vision of Sugawara no Michizane appeared to him in a dream and told him to go to China and study meditation.  Following this vision, he met the Rinzai teacher Wuzhun Shifan in China, and studied Mahayana with him.  When he returned to Japan, he founded Tōfuku-ji monastery in Kyoto, and practiced Zen as well as other types of Buddhism.  His disciples included Mujū. Ajahn Sucitto (Bhikkhu Sucitto, born 4 November 1949) is a British-born Theravada Buddhist monk ("ajahn" is the Thai rendition of ācārya [Sanskrit] "teacher").  He was, between 1992 and 2014, the abbot of Cittaviveka, Chithurst Buddhist Monastery.  He was born in London, and was ordained in Thailand in March 1976.  He returned to Britain in 1978 and took up training under Ajahn Sumedho at the Hampstead Buddhist Vihara.  In 1979 he was one of the small group of monks, led by Ajahn Sumedho, who established Cittaviveka, Chithurst Buddhist Monastery, in West Sussex.  In 1981 he was sent up to Northumberland to set up a small monastery in Harnham, which subsequently became Aruna Ratanagiri.  In 1984 he accompanied Ajahn Sumedho in establishing Amaravati Buddhist Monastery in Hertfordshire.  In 1992 he was appointed abbot of Cittaviveka.  On October 26, 2014, he resigned the post, but intends to continue teaching as before. Hong Yi (23 October 1880 – 13 October 1942; ), born Li Shutong (李叔同) was a Chinese Buddhist monk, artist and art teacher.  He also went by the names Wen Tao, Guang Hou, and Shu Tong, but was most commonly known by his Buddhist name, Hong Yi.  He was a master painter, musician, dramatist, calligrapher, seal cutter, poet, and Buddhist monk. Kauṇḍinya (Sanskrit; Pali: "Koṇḍañña") also known as "Ājñātakauṇḍinya", Pali: "Añña Koṇḍañña") was a Buddhist monk follower of Gautama Buddha and the first to become an arhat.  He lived during the 6th century BCE in what is now Uttar Pradesh and Bihar, India.
Answer: in the eastern part of ancient India