Notwithstanding these the canyons remain almost terra incognita for each new navigator.

The Soviet Union remained close to terra incognita for American spies.

The ' terra incognita of the map was rapidly becoming nicely tinted.

The other side of the San Agustín Sump was terra incognita.

All beyond, as before remarked, is terra incognita to the inhabitants of Santarem.

But is not each generation a terra incognita to the last?

Outer space aside, this is truly humanity's last terra incognita.

If Iowa was terra incognita for her, New Hampshire was terra firma: familiar, friendly, safe.

How much consumers use those apps and where they go from there is terra incognita.

But the whole subject of comparative mythology seems to be terra incognita to Mr. Gladstone.

They learned something of the character of the region heretofore regarded as a veritable terra incognita.

He was surveying a fringe of the Seergon Cluster, which at that time was terra incognita.

The West was terra incognita to Joel, and he found much to interest and puzzle him.

When we crossed the Laramie plains I was in, to me, a " terra incognita."

From such a terra incognita, at length unveiled to eyes so discerning, I anticipate strange tidings.

From the bottom of the hill to the far horizon is terra incognita, a landscape permanently veiled.