• Kundalvar Dweep is the 11th island in the middle world (Madhyaloka) of Jain cosmology.
• It is surrounded by its own ocean, known as the Kundalavara Ocean.
• This island lies in the sequence of the first 13 Terahdweeps (the “three worlds” structure), which begin with Jambūdvīpa at the center and expand outward in circular rings.

Important context:

• The Middle World has a fixed order of continents (dvīpas) and oceans. Kundalvar is one of the names that appears in this traditional list, especially in Śvetāmbara sources; Digambara sources sometimes present slightly different spellings or orders but keep the same general structure.
• The boundary beyond which ordinary humans do not go is marked by Manushottar Parvat (the boundary mountain). Kundalvar Dweep is well inside this boundary, within Dhaei Dweep (two and a half islands: Jambudweep, Dhatkikhand, and half of Pushkarvardweep), with many more islands and oceans beyond in the extended scheme.

If you’d like, I can summarize the sequence of the first 13 islands and their oceans in a simple list.