In the Ramayana, when Lakshmana was wounded and needed the Sanjeevani herb to save his life, Hanuman flew to the Dronagiri (also called Sanjeevani or Mahodaya) mountain in the Himalayas. He couldn't identify the specific herb, so he lifted the entire mountain and carried it to Lanka. Dhumrakalpa, Meru, and Vindhya are other mythological mountains but not the one Hanuman carried.