Play video content Exclusive TMZ.com

If you've ever wondered how Amazon can get packages to people so damn fast, get a load of this ... it might just answer your question.

TMZ got footage of a remote location just east of L.A. where the online retailing giant stashes hundreds of delivery vans ... literally at the ready in a hillside dirt parking lot. Check out the clip, it's an impressive sight ... rows upon rows -- each at least 100 deep -- of vehicles parked side-by-side.

BTW, this isn't Amazon going rogue and plopping its fleet in a random open space -- like much of L.A.'s real estate lately ... Jeff Bezos is paying for this space. Although, he didn't buy this one yet ... Amazon's just renting.

Ya gotta figure Amazon has similar hidden storage spots all over the country.

Naturally, that might lead to more criticism of Bezos himself, who's been grilled lately for not being quick enough to offset Amazon's massive carbon footprint on the environment. Ya still gotta give him credit for recently starting a new Earth Fund with billions of dollars of his own cash.