東經九十度洋脊是印度洋的洋脊，位於北面的安達曼群島和南面的印度洋東南海嶺之間，全長約5,000公里，平均寬度200公里，北部和南部分別在4,320萬年和8,180萬年形成。[1]
印度洋底地形圖，東經九十度洋脊是中央偏右南北走向者。
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3°S 90°E
