Another 6th-century source refers to them living among nearly impenetrable forests, rivers, lakes, and marshes.

Our left flank is quite secure, he says, an impenetrable marshy forest.

But it is surrounded by nearly impenetrable Amazonian forest.

He gazed up in terror at the forbidding, impenetrable forest and said: "Guys, where are we?"

I don't call that much to look at," and he pointed to the almost impenetrable forest over which they then were.

The first settlers arrived in the Middle Ages and began clearing the impenetrable forest.

Too many of his words simply lie there inertly, forming impenetrable forests.

Epiphytes were the only growth on the bare branches, and we could see great distances into what, in a different season, would be impenetrable forest.

Cast from your mind thoughts of a dark, black impenetrable forest.

An empty stream, a great silence, an impenetrable forest.