There are extensive/vast forests in the western U.S. and Alaska. Most of the world including the forests in the U.S. have been explored and habitated for many years. There are places where no one has been for a while or is little used, but most of all land on the earth has been inhabited for many years. Even the Arctic and Antarctic are somewhat habitable and have small populations that are permanent. You should check the world population density maps. This will tell you where the least habitable places to live on the earth are. Siberia in Russia is one area that has little population because of extreme temperature variances. These are mostly extremely cold locations most or all of the year. You should also check forestation maps for coniferous forests. most of the U.S. is farm ground in the center of the country, mountains toward California have most of the coniferous forests. these start at the Rocky mountains. The side towards New York has a small mountain chain that has mixed hard wood and coniferous forests. These run the length of the U.S. from Maine to Florida. The mountain states include Washington, Oregon, California, Arizona, Nevada, Utah, Idaho, Montana, Wyoming, South Dakota, Colorado, New Mexico and all of Alaska. Check the area of these to see how vast they are. You can check the area of any state by square mileage or KM. Alaska's area is far larger than many of the "lower 48" states put together. If you are doing research about nature, shouldn't you be exploring flora and fauna and the life that inhabits it? Some ecosystems are very specific as to the life that inhabits it. Check rainfall amounts globally. Lifeforms are very specific as to the conditions they are subjected to. Most have evolved into very specific environments Each states fish and game departments will have all the data you could want on mammal and fish species and the USGS(united states geological survey) will have all the geological and geophysical info, places like Cornell university has info on avian data. You can look up anything if you truly try. Look up Medicine lodge state park's petroglyphs in Wyoming and you will see some historical data. You have chosen a very large sub-set of things that you will have to look through. I really hope you find something in all this that you can get a better idea of what you need.