MikeI'm afraid I don't know the answer to that one. My guess is that it is either in Japan or Kamchatka. You should go to the nearest library or bookstore and find a copy of "Volcanoes of the World" by Tom Simkin and Lee Seibert. Then look through their exhaustive tables to find out which is the tallest. You'll also have to decide on what your definition of "Asia" is.
Sincerely,
Scott Rowland
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