[MediaMole]

It looks like evidence of farming. The patterns look like those of Asian terraced rice farms.

Personally, I think we discount the technology available to people thousands of years ago. The Romans were able to do things that we couldn’t do until the turn of the 20th century.

There is no reason why they didn’t build boats and trade between cultures.

[ApplegateRanch]

However, they are extremely narrow in relation to their length… some 5 feet wide to several thousand feet long.

It's those famous spaghetti fields:

Living is easy with eyes closed
Misunderstanding all you see
Its getting hard to be someone,
but it all works out
It doesnt matter much to me

Let me take you down, cause Im going to
Spagetti fields
Nothing is real
And nothing to get hung about
Spaghetti fields forever

Spaghetti fields forever!