This technical report provides detailed information that supports the White Pine in the Lake Abitibi and Lake Temagami Ecoregions of Ontario public report that is part of the Ontario Ministry of Natural Resources' State of Resources Reporting series. It presents a brief review of the ecology of white pine, with special reference to the Lake Abitibi (3E) and Lake Temagami (4E) ecoregions of northeastern Ontario. As well, it provides a detailed presentation and discussion of provincial data on the current status and management of this resource. An overview of the climate, physiography, geology, soils, ecology, and ecological values associated with white pine forests in this region is followed by a review of the historical social and economic importance of white pine to both the province and the region. The manner in which European settlement and the historical development of Ontario shaped the extent, composition, structure, condition, and management of the white pine resource in the region is discussed. The policies and management practices, as well as challenges to white pine management in these ecoregions are summarized. The report concludes with a discussion of modelling efforts to compare the effects of current selected management scenarios on the future extent of white pine forests and associated wood supply.--Document.