Bay of Bengal

n. arm of the Indian ocean

The Bay of Bengal is a bay that forms the northeastern part of the Indian Ocean. It resembles a triangle in shape, and is bordered on the east by  Burma and the Andaman and Nicobar Islands, and on the west by India and Sri Lanka. On the northern tip of the "bay" lies the Bengal region, comprising the Indian state of West Bengal and the country of Bangladesh, thus the name. The southern boundary of the Bay stretches from the southern end of Sri Lanka to the northern tip of Sumatra.
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Noun
1. an arm of the Indian Ocean east of India
(hypernym) bay
(part-holonym) Indian Ocean
(part-meronym) Andaman Sea