Kurma (Sanskrit: कूर्म, lit. 'Turtle' or 'Tortoise'), is the second avatar of the Hindu preserver deity, Vishnu. Originating in Vedic literature such as the Yajurveda as being synonymous with the Saptarishi called Kashyapa, Kurma is most commonly associated in post-Vedic literature such as the Puranas. He prominently appears in the legend of the churning of the Ocean of Milk, referred to as the Samudra Manthana. Along with being synonymous with Akupara, the World-Turtle supporting the Earth, Kurma is listed as the second of the Dashavatara, which are the ten principal incarnations of Vishnu.