This is a repackaging of the parts that were originally available only as bonuses during the Tsuro of the SeasKickstarter.
Game description from the publisher:
The forces of nature can be as devastating as the wrath of the daikaiju! With Tsuro of the Seas: Veterans of the Seas, an expansion for Tsuro of the Seas, you'll be able to add more excitement to your game with the Tsunami (Tidal Wave) and Uzushio (Whirlpool) tiles. This tile set also provides you with hope, however, as the Taihou (Cannons) and the Mystic Portal (Magic) may help you to overcome the devastation and be victorious!