This post is an attempted list of the largest forests on Earth. This post is a work in progress as I find more forests that belong on this list. There are 14 forests listed below.
1. Tiaga (North America, Europe, Asia) - 17 million km sq
Photo source: Wikimedia Commons, L. B. Brubaker
2. Amazon Rainforest (South America) - 7 million km sq
Photo source: Wikimedia Commons, Neal Palmer (CIAT)
License: CC BY-SA 2.0
3. Congo Basin (Central Africa) - 3.7 million km sq
Photo source: Wikimedia Commons, Antoine Penda
License: CC BY-SA 4.0
4. Central Zambezian miombo woodlands (South Central Africa) - 1.8 million km sq
Photo source: Wikimedia Commons, Grahamcole
License: CC BY-SA 4.0
5. Atlantic Forest (Brazil, Paraguay, Argentina) - 1.3 million km sq
Photo source: Wikimedia Commons, Marcelino Dias
License: CC BY-SA 2.0
6. Valdivian temperate rain forest (Chile, Argentina) - 248,000 km sq
Photo source: Wikimedia Commons, Rodolfo Andres Sanchez S.
License: CC BY-SA 4.0
7. Eastern Great Lakes lowand forests (United States, Canada) - 116,000 km sq
Photo source: Wikimedia Commons, jockrutherford
License: CC BY-SA 2.0
8. Tongass National Forest (Alaska) - 68,000 km sq
Photo source: Wikimedia Commons, Brad Hunter
9. Sumatra Rainforest (Indonesia) - 25,000 km sq
Photo source: Wikimedia Commons, Hugo Rio Aditya
License: CC BY-SA 4.0
10. Bosawas Biosphere Reserve (Nicaragua) - 20,000 km sq
Photo source: Wikimedia Commons, Rebecca One
License: CC BY-SA 3.0
11. Lacandon Jungle (Mexico, Honduras) - 19,000 km sq
Photo source: Wikimedia Commons, Carlos Rojas
12. Sundarbans (Bangladesh, India) - 10,000 km sq
Photo source: Wikimedia Commons, Pratyaya Ghoshal Das
License: CC BY-SA 4.0
13. Black Forest (Germany) - 6,000 km sq
Photo source: Wikimedia Commons, Andrea Eichier (Hockei)
License: CC BY-SA 4.0
14. Sequoia National Forest (United States) - 4,800 km sq
Photo source: Wikimedia Commons, Nightryder84
License: CC BY-SA 3.0