[spbaar]

Didn't it also mention that a lot of survivors hit some type of slope?

[merely-unlikely]

Not sure if it was the same one but I've read you also want to avoid water (since it doesn't compress). Go for dirt/grass if possible.

[ars]

That doesn't make sense: dirt/grass also don't compress. Small branches might be good, but water is certainly more compresible than dirt.