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.

[Q]: Category: TOUGH BODIES OF WATER 
Clue: Finland's Aland Islands lie at the southern edge of this gulf
[A]: the gulf of bothnia


[Q]: Category: ROYAL WOMEN 
Clue: Nori, his daughter, only fit the category until Nov. 15, 2005, when she married a commoner
[A]: akihito


[Q]: Category: SOUTH AMERICA 
Clue: 7 of this river's more than 1,000 known tributaries exceed 1,000 miles in length
[A]:
amazon