Answer

Yes, in Jain cosmology, oceans existed during the era of Lord Adinath. The Jain universe contains samudras and dvipas as permanent parts of its structure, so oceans are not seen as something that suddenly appeared later.

Explanation

In Jain tradition:

• The world is described through a cosmic geography of Jambudvipa, surrounding oceans, and other regions.
• Oceans like Lavana Samudra are part of that eternal cosmic arrangement.
• So, during the time of Lord Adinath, oceans were present in the Jain cosmological sense.

If you are asking about the modern physical oceans of today’s Earth, Jain texts do not discuss them in the same geographical way modern science does. Jainism speaks more about the cosmic world-system than present-day map-based geography.

Spiritual Understanding

Jain cosmology shows that the universe has an orderly and timeless structure. This helps us understand that:

• creation is not random,
• the universe follows fixed principles,
• and the lives of the Tirthankars unfold within that sacred cosmic order.

Takeaway

So, according to Jain Dharma, yes, oceans existed in Lord Adinath’s era—as part of the eternal Jain universe. If you want, I can also explain Jain cosmology of Jambudvipa and the surrounding oceans in a simple way.