| Devanagari: | कालिय |
| Sanskrit Transliteration: | Kāliya |
| Affiliation: | Nāgas |
| Festivals: | Nāga Nathaiyā |
| Parents: | Kashyapa (father) Kadrū (mother) |
| Siblings: | Śeṣa, Vāsuki, etc. |
| Texts: | Bhāgavata Purāṇa, Harivaṃśa Purāṇa, Mahābhārata |
| Gender: | Male |
| Spouse: | Suraśa[1] |
| Type: | hindu |
Kaliya (IAST: Kāliya, Devanagari: कालिय), in Hindu traditions, was a venomous Nāga living in the Yamunā river, in Vṛndāvana. The water of the Yamunā for four leagues all around him boiled and bubbled with poison. No bird or beast could go near, and only one solitary Kadamba tree grew on the river bank. The celebration of Nāga Nathaiyā or Nāga Nṛitya is associated with the tale of Krishna dancing upon and subduing Kāliya.
The story of Krishna and Kāliya is told in the sixteenth chapter of the Tenth Canto of the Bhagavata Purana.
The proper home of Kāliya was the island of Ramaṇaka, but he had been driven away from there in fear of Garuḍa, the foe of all serpents. Garuḍa had been cursed by the yogi Saubhari dwelling at Vrindavan so that he could not come to Vrindavan without meeting his death. Therefore, Kāliya chose Vrindavan as his residence, knowing it was the only place where Garuḍa could not come.
Once, the sage Durvasā came as a guest and was served by Rādhā. After this episode, Rādhā took a walk across the river Yamunā and became terrified upon seeing the giant serpent. She fled to Vrindavan where she informed the people that she had seen a giant serpent in a river. Krishna was very angry upon hearing this and wanted to teach a lesson to Kāliya as he had troubled his Rādhā. He went to the river Yamunā searching for Kāliya, who upon seeing Krishna, coiled around Krishna's legs and constricted him.
The people of Gokulam came to see that Krishna was in the river. Yaśodā was afraid of the snake and ordered Krishna to return at once. Meanwhile, Kāliya attempted to escape, but Krishna stomped on his tail and warned him to not trouble anyone again before returning to the people. The next day, Krishna was playing a ball game across the Yamuna with Rādha and friends. After the ball fell into the Yamunā, Rādhā tried to retrieve it, but Krishna stopped her and offered to do so. When he went into the Yamunā, Kāliya constricted him and pulled him into the Yamunā.
The people of Gokulam heard the commotion and all the people of Nandagokula were concerned and came running towards the bank of the Yamunā. They heard that Krishna had jumped into the river where the dangerous Kāliya was staying. At the bottom of the river, Kāliya had ensnared Krishna in his coils. Krishna expanded himself, forcing Kāliya to release him. Krishna immediately regained his original form and began to jump on all of Kāliya's heads so as to release the poison in the snake so that he could no longer pollute the Yamunā.
Krishna suddenly sprang onto Kāliya's head and assumed the weight of the whole universe, beating him with his feet. Kāliya started vomiting blood and slowly began to die. But then Kāliya
The people who had gathered on the banks of Yamunā were terrified, beholding the water that had changed to a poison colour. Krishna slowly rose up from the bottom of the river while dancing on Kāliya's head. When the people saw Krishna, everyone was happy and they danced ecstatically upon Kāliya. At last, Kāliya was pushed into Pātāla where he is said to reside to this day.
This event is often referred to as the Kāliya Nāga Mardan.
According to one regional legend, Krishna banished Kaliya to the Ramanik Deep, which the Fiji Indians believe to be in Fiji. Moreover, native Fijians also believed in a serpent-god called Degei.[2]