Jambudweep (also Jambudvipa) is a key concept in Jain cosmology rather than a historical place. Here is a simple, authentic Jain view:

• What it is: Jambudweep is the great southern continent (dvip) in the Jain宇, the cosmic map described in Jain scriptures. It is one of the major landmasses around the central cosmic Mount Meru.
• Position in the cosmos: The Jain world-system envisions Mount Meru at the center, with surrounding continents (dvipas) arranged around it. Jambudweep is the landmass where human society, including the world “Bharat” (the land of the present-day Bharata), is said to have existed.
• Significance for Jain practice: Many Tirthankaras and their disciples are described as appearing or having teachings in Jambudweep. It is also the traditional setting for many Jain legends, including the lifespans and lineages of various Tirthankaras and important sramana figures.
• Cultural and doctrinal notes: Jambudweep is described in classical Jain canonical and narrative literature (including texts that recount the lives of Tirthankaras and the history of Jain lineages). There are differences in how Digambaras and Śvetāmbaras present cosmology, geography, and chronologies, but both traditions treat Jambudweep as a sacred, symbolically meaningful part of the Jain universe rather than a geographic region in the modern sense.
• Why it matters today: For practitioners and students, Jambudweep serves as a cosmological framework that deepens understanding of the Jain view of time, space, and moral progress. It reinforces the idea that spiritual goals transcend place and that tirthankaras appear in specific cosmic ages to guide beings toward liberation.

If you’d like, I can provide the classic Jain scriptural references for Jambudweep (and note where Digambara and Śvetāmbara traditions differ) or help locate a reliable Jain text excerpt that describes it.