Japanese mizunara oak is a unique tree species native to Japan, known scientifically as Quercus mongolica var. grosseserrata. It typically grows in mountainous regions and can reach heights of up to 30 meters. The tree is characterized by its distinctive, irregularly shaped leaves and light-colored bark. This oak is highly valued for its wood, which is used in making high-quality barrels for aging Japanese whisky. The porous nature of the wood allows for a unique interaction between the spirit and the barrel, contributing to the distinct flavors found in many Japanese whiskies.