According to The Land Report’s research, the land is held directly and through third-party entities by Cascade Investments, Gates’ personal investment vehicle. Cascade’s other investments include food-safety company Ecolab, used-car retailer Vroom and Canadian National Railway.

While it may be surprising that a tech billionaire would also be the biggest farmland owner in the country, this is not Gates’ only foray into agriculture. In 2008, the Bill and Melinda Gates Foundation announced $306 million in grants to promote high-yield, sustainable agriculture among smallholder farmers in sub-Saharan Africa and South Asia. The foundation has further invested in the development and proliferation of “super crops” resistant to climate change and higher-yield dairy cows. Last year, the organization announced Gates Ag One, a nonprofit to advance those efforts.

It is not entirely clear how Gates’ farmland is being used, or whether any of the land is being set aside for conservation. (Cascade did not return Forbes’ request for comment.) However, there is some indication that the land could be used in a way that aligns with the foundation’s values. Cottonwood Ag Management, a subsidiary of Cascade, is a member of Leading Harvest, a nonprofit that promotes sustainable agriculture standards that prioritize protections of crops, soil and water resources.