Asked for the best watermelon producing area in Japan

Yamagata Prefecture Ozawazawa City is Japan's best watermelon production in summer. "Ozanawazawa watermelon" is known for being greatly sweet. The kind of attention now is "Blackjack." Without seeds, excellent in sugar content, it is the ultimate watermelon that I have never met before. There are lots of gourmet using watermelon in the city. How about a journey to enjoy watermelons?