The highest peaks are situated in the still unexplored district of Talikan, N.W.
Napoleon had forced the Portuguese government to cede to him the northernmost arm of the mouth of the Amazon as the southern boundary of French Guiana with a large slice of the unexplored interior westwards.
A considerable portion of the district remains unexplored.
The chief element of uncertainty as to the largest features of the relief of the earth's crust is due to the unexplored area in the Arctic region and the larger regions of the Antarctic, of which Crustal we know nothing.
Much of the interior of the province is still unexplored.