Which three regions were part of the Indian Ocean trade route?

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East Africa, the India and Southeast Asia.

The three regions that were part of the Indian Ocean trade route were:

1. East Africa: This region, encompassing the Swahili Coast and the East African hinterland, played a significant role in the Indian Ocean trade. Cities like Mombasa, Zanzibar, and Kilwa were major trading hubs, connecting the African interior with the Indian Ocean network.

2. Arabian Peninsula: The Arabian Peninsula, particularly the ports of Oman and Yemen, served as crucial centers for commerce and maritime trade. Cities such as Aden and Muscat were important ports along the Indian Ocean trade route, facilitating the exchange of goods between Africa, Asia, and Europe.

3. Indian subcontinent: The Indian subcontinent, with its diverse and prosperous civilizations, including India and Sri Lanka, had a long history of maritime trade. The ports of Calicut (now Kozhikode) and Surat on the western coast and the Coromandel Coast in southeastern India were major trading centers, attracting merchants from various parts of the world.

To find the answer to your question, one can examine historical records, travelogues, and trade routes maps from various sources. Additionally, studying the history of these regions can provide insights into the Indian Ocean trade route and its significance. Academic books, research articles, and online resources related to Indian Ocean trade can also offer a comprehensive understanding of this topic.