Question: What is the old growth extent in hectares of the Eurasian old-growth forest that is home to 800 European bison ?

text: List of old-growth forests
Eurasia
Biogradska Gora , Montenegro Primeval Beech Forests of the Carpathians Yakushima , Japan
This is a list of existing old-growth (virgin) forests, or remnants of forest, of at least 10 acres (4.0 hectares). ecoregion information from Terrestrial Ecoregions of the World. (NB: The terms old growth and virgin may have various definitions and meanings throughout the world. See old-growth forest for more information.)
Country Area Old-growth extent WWF ecoregion Old-growth forest type
Azerbaijan Lankaran lowland and Talysh mountains  Caspian Hyrcanian mixed forest temperate broadleaf and mixed forests biome
Belarus , Poland Białowieża Forest 308,580 hectares ( 762,500 acres ) Central European mixed forests
Bosnia and Herzegovina Perućica 1,434 hectares ( 3,540 acres ) Dinaric Mountains mixed forests
Bulgaria Ancient and Primeval Beech Forests of Europe in the Central Balkan National Park 1,098,891 hectares ( 2,715,420 acres ) Rodope montane mixed forests Temperate broadleaf and mixed forests biome
Bulgaria Bayuvi Dupki-Dzhindzhiritsa ( temperate coniferous forest ) , Pirin National Park 2,873 hectares ( 7,100 acres ) Rodope montane mixed forests Temperate broadleaf and mixed forests biome
Bulgaria Mantaritza Biosphere Reserve forests 1,320 hectares ( 3,300 acres ) Rodope montane mixed forests Temperate broadleaf and mixed forests biome
Bulgaria Parangalitsa Reserve forests , Rila National Park 1,509 hectares ( 3,730 acres ) Rodope montane mixed forests Temperate broadleaf and mixed forests biome
Bulgaria Uzunbodzhak Reserve temperate rainforest , Strandzha Nature Park , Strandzha Mountain 2,529.6 hectares ( 6,251 acres ) Euxine-Colchic deciduous forests Temperate broadleaf and mixed forests biome ( Euxine-Colchic deciduous forests )
Czech Republic Boubin Primeval Forest 685.9 hectares ( 1,695 acres )
Finland Pyhä-Häkki National Park  Scandinavian and Russian taiga Scots pine and Norway spruce
France Réserve Biologique Intégrale d'Assan 1,032 hectares ( 2,550 acres ) Temperate coniferous forest Pinus sylvestris , Abies alba , Larix decidua , Juniperus thurifera and Pinus uncinata
France Réserve Biologique Intégrale de Chaux 148 hectares ( 370 acres ) Temperate broadleaf and mixed forest Abies alba , Picea abies and Fagus sylvatica
France Réserve Biologique Intégrale de la Glacière 28 hectares ( 69 acres ) Temperate broadleaf and mixed forest Abies alba , Picea abies and Fagus sylvatica
France Réserve Biologique Intégrale de la Sainte-Baume 138 hectares ( 340 acres ) Temperate broadleaf and mixed forest Fagus sylvatica , Quercus pubescens , Taxus baccata , Ilex aquifolium , Tilia cordata , maple and Quercus ilex
France Réserve Biologique Intégrale de la Sylve dArgenson 2,579 hectares ( 6,370 acres ) Temperate broadleaf and mixed forest Fagus sylvatica , Quercus petraea and Quercus robur
France Réserve Biologique Intégrale de Saint-Pé-de-Bigorre 1,010 hectares ( 2,500 acres ) Temperate broadleaf and mixed forest Fagus sylvatica , Tilia cordata and Maple
France Réserve Biologique Intégrale des Maures 2,531 hectares ( 6,250 acres ) Mediterranean forests , woodlands , and scrub Quercus ilex , Quercus suber , Castanea sativa and Pinus pinaster
France Réserve Biologique Intégrale du Mont Ventoux 906 hectares ( 2,240 acres ) Temperate broadleaf and mixed forest Pinus uncinata , Pinus nigra , Pinus sylvestris , Fagus sylvatica and Abies alba
France Réserve Biologique Intégrale du Défilé de Straiture 124 hectares ( 310 acres ) Temperate broadleaf and mixed forest Abies alba , Picea abies and Fagus sylvatica
France Réserve Biologique Intégrale d'Oléron - Saint-Trojan 158 hectares ( 390 acres ) Temperate broadleaf and mixed forest Quercus ilex , Quercus petraea and Pinus pinaster