Subregions- Arabian Sea
 - Broken Ridge
- Carlsberg Ridge
- Chagos Archipelago region
- Crozet Islands region
- Gulf of Aden
- Indian Ocean Triple Junction
- Kerguelen Islands region
- Laccadive Sea
- Lakshadweep region, India
- Maldive Islands region
- Mauritius - Reunion region
- Mid-Indian Ridge
- northeastern Somalia
- North Indian Ocean
- Owen Fracture Zone region
- Prince Edward Islands region
- Socotra region
- southeast Indian Ridge
- southern Kerguelen Plateau
- South Indian Ocean
- south of Africa
- south of Australia
- Southwest Indian Ridge
- Sri Lanka
- western Indian-Antarctic Ridge
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