Ramyak Kshetra is a Jain cosmology term.

• It is one of the seven regions (kshetras) of Jambudvipa, the central land in the Jain universe. This division is part of the traditional Jain map of the world (madhyaloka). ( jainknowledge.com)
• In many descriptions, Ramyak Kshetra lies in the middle world between the Nila and Rukmi mountains, with oceans on its east and west, and it is a place where beings reside and spiritual practice can occur. The exact boundaries and names of surrounding regions can vary slightly between texts. ( jainknowledge.com)
• There is a difference of tradition on how to categorize Ramyak Kshetra: some Jain texts describe it as a karmabhumi (where austerities and liberation are possible), while others list it among the bhogabhumi (realm of worldly pleasure). This reflects differences between Digambar and Śvetāmbara traditions in minor details, but the broad idea of Ramyak as one of the seven kshetras remains common. ( jainqq.org)

If you’d like, I can point to a specific Jain Knowledge page that explains the Ramyak Kshetra in more detail. You can read more here