Where is the largest Gingko farm in world located?

There is no known "largest Gingko farm" in the world.

Ginkgo trees are primarily found in urban areas and parks, rather than large-scale farms. This is because they are valued for their beauty, resilience, and historical significance, not for commercial agricultural purposes.

While there may be locations with a high concentration of Ginkgo trees, there isn't a single location that stands out as the "largest Gingko farm."