I am a huge fan of the TV series M*A*S*H. All of the outdoor scenes were filmed at the 20th Century Fox "ranch" outside of Malibu. I am pretty sure that the movie was filmed there as well. That land has since been donated to the State of California, and is now part of Malibu Creek State Park. It's open to the public.
Here are a couple of websites with information on the park and a few pictures. They have marked the outline of all of the tents with rope.
The MASH site in Malibu Creek State Park
http://www.hikespeak.com/trails/mash-hike-malibu-creek-state-park/
MASH Tv Show Filming Site in Malibu Creek State Park aka home of the awesome park map.
http://www.campingfantastic.com/2/post/2011/1/mash-tv-show-filming-site-in-malibu-creek-state-park-aka-home-of-the-awesome-park-map.html
Here are a couple of websites with information on the park and a few pictures. They have marked the outline of all of the tents with rope.
The MASH site in Malibu Creek State Park
http://www.hikespeak.com/trails/mash-hike-malibu-creek-state-park/
MASH Tv Show Filming Site in Malibu Creek State Park aka home of the awesome park map.
http://www.campingfantastic.com/2/post/2011/1/mash-tv-show-filming-site-in-malibu-creek-state-park-aka-home-of-the-awesome-park-map.html