You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
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Question: Category: TOUGH BODIES OF WATER
Clue: Finland's Aland Islands lie at the southern edge of this gulf

Answer: the gulf of bothnia

Question: Category: NOTED BLACK AMERICANS
Clue: This big band leader won 3 Grammys for his work on the 1959 courtroom drama "Anatomy of a Murder"

Answer: duke ellington

Question: Category: LESSER-KNOWN NAMES
Clue: Julia Morgan designed a castle for this publisher's San Simeon, California estate

Answer:
hearst