Answer

I think you mean Aḍhāī-dvīpa. In Jain cosmology, it means “Two and a Half Continents”—the special part of the middle world where human beings can live. ( jainpedia.org)

Explanation

Imagine a giant Jain picture map made of circles. In the center is Jambū-dvīpa, then comes the Salt Ocean, then Dhātakīkhaṇḍa, then the Black-water Ocean, and then half of Puṣkara-dvīpa. That is why it is called “two and a half.” It is like saying, “This is the human part of the big cosmic map.” ( jainpedia.org)

Spiritual Understanding

For Jains, this is important because the Middle World is the place where human beings can be born, and human life is precious for spiritual progress. It is where the soul can practice right conduct, reduce karma, and move toward liberation. ( jainpedia.org)

Takeaway

So, in very simple words: Aḍhāī-dvīpa is the Jain “human-world” in the middle of the universe—the place where we live, learn, and try to become spiritually better. ( jainpedia.org)