Sundarakānda - Canto 1

Śrīmad Vālmīki-Rāmāyana Part-II, Gita Press

Desirous of reaching Lankā in order to discover Sītā, Hanumān takes a leap from a peak of Mount Mahendra and honouring with the touch of his hand Mount Maināka, which rose from the bottom of the sea to provide rest on its peak to Hanumān, encounters Surasā (mother of Nāgas), sent by the gods in the form of an ogress, who was waiting for Hanumān with her mouth open to devour him. He enters her belly assuming a minute form and comes out without killing her. Further, he is met by another ogress, Simhikā by name, standing with her mouth wide open to gulp Hanumān. He enters her mouth after assuming a minute form and comes out after splitting her belly open and killing her. Then contracting his body into a minute form again in order to preclude the attention of the ogres, he descends on a mountain peak outside Lankā.

Please note that due to the length of this Canto there are several readers.