In Jain cosmology, "Madhyaloka" refers to the middle world or the middle region of the universe, where human beings, animals, and many other living beings reside. According to Jain scriptures, Madhyaloka is divided into several regions:

1. Jambudvipa: This is the central continent and the most significant. It is where humans live and where Tirthankaras are born. Mount Meru (Sumeru Parvat) is at its center.

1. Dhatakikhanda: Surrounding Jambudvipa is Dhatakikhanda, another landmass shaped like an island.

1. Pushkaradvipa: Outside Dhatakikhanda lies Pushkaradvipa, another continent.

1. Lavaṇasamudra (Salt ocean): Oceans of salt water, known as Lavaṇasamudra, separate the above continents.

1. Dhimikikhanda: Further out, there are regions like Dhimikikhanda and other continents and oceans in alternating rings.

In summary, the main regions described in Madhyaloka are:

• Jambudvipa
• Dhatakikhanda
• Pushkaradvipa
• Lavaṇasamudra (Salt ocean)
• Other dvipas (islands/continents) and samudras (oceans) in concentric rings

These regions are detailed in Jain texts such as the "Tiloyapannatti" and "Trilokasara."