The seacoast of the State of Maine is rugged and hilly. The primitive rocks of which its geological structure is chiefly composed are broken into ridges which run parallel to the great streams, and therefore in a direction from north to south. These ridges terminate in an irregular line, which to the east of the Penobscot may be identified nearly with the military road to Houlton. From the northern summit of these ridges an extensive view of the disputed territory can in many places be obtained. This is the case at the military post at Houlton, whence a wide extent of country may be seen. A still more perfect view may be obtained from the summit of Parks Hill, at a point about 400 yards south of the road from Houlton to Woodstock and about half a mile east of the exploring meridian line. At the time when that line was run by the British and American surveyors, under the fifth article of the treaty of Ghent, the top of this hill was covered with wood, and they were obliged to content themselves with the view from Park's barn, which is at least 200 feet beneath the summit. At the present moment the latter is cleared, and the view from west-southwest to northeast is unimpeded except by a single clump of trees, which cuts off the view for a few degrees in the northwest direction; but by a change of position every part of the horizon between these points is to be seen. Toward the west are seen ridges parallel to the Penobscot, over which Katahdin towers to a great height, bearing by compass N. 85° W. In a direction N. 75° W. are seen two distant peaks, one of which was identified as the Traveller. All of these eminences lie south of the line claimed by Great Britain. In the north-northwest direction there appear two ridges of comparatively small elevation, which were pointed out as the Aroostook Mountains, but have since been ascertained to lie near the sources of the Meduxnikeag. These lie in the line claimed by Great Britain in 1817.

Between these and the other mountains there is evidently no connection, and the rest of the country, as seen from the hill, bears the aspect of a wooded plain. It will be sufficient to refer to this view to be satisfied that all the impressions which have been circulated of a continuous chain of elevations extending along the line claimed by Great Britain are utterly fallacious.

Toward the north the country exhibits the same general features. One vast and apparently unbroken plain extends to the utmost limits of the visible horizon. In the midst of this, and at a distance of nearly 30 miles, Mars Hill alone breaks the monotonous prospect, and from its isolated position assumes to the eye an importance to which its altitude of less than 1,800 feet would not otherwise entitle it. No other eminences are to be seen in this direction, except a round peak bearing a few degrees west of north and some distant ridges about an equal distance to the east. The first of these has been ascertained by the surveys of Major Graham to be an isolated hill near the peak known as Quaquajo. The eastern ridges are probably those measured between the Tobique and the Bay of Chaleurs by the British commissioners. A sketch of this view from Parks Hill is annexed to the report, and lest any doubt be entertained of its accuracy it is proper to state that the unassisted vision was not relied upon, but that the outlines were carefully delineated by means of the camera lucida.

From this view it might be inferred that the northern part of the admitted possessions of the United States to the east of the Penobscot and the disputed territory as far as visible constitute a vast table-land slightly inclined toward the southeast.

On descending into the valley of the St. John the appearances change. The tableland is cut to a great depth by that stream, and from its bed the broken edges of the great plain look like ridges whose height is exaggerated to the senses in consequence of their being densely clothed with wood. The same is the case with all the branches of this river, which also cut the table-land to greater or less depths according to their distance from the stream into which they discharge themselves.

The want of a true highland or mountainous character in this region is obvious from the aspect it presents in the two different points of view. Mountainous regions are most imposing when seen from a distance and from heights. On a nearer approach, and from the valleys which intersect them, the elevations, so important in the distant view, are hidden by their own slopes or lose the appearance of relative elevation in consequence of the absolute heights of the valleys themselves. In conformity with this character, the line claimed by the United States for the most part presents, when seen at a distance, the appearance of lofty and deeply serrated ridges, while to one who traverses it it is a labyrinth of lakes, morasses, and short but steep elevations which hide its peaks from the valleys and streams.

The line claimed by Great Britain, on the other hand, when seen from a distance is as level as the surface of the ocean, with no greater appearance of elevation and depression than would represent its billows; while, seen from its own valleys, the heights assume an importance which their elevation above the valleys when actually measured does not warrant. The characteristics of the region through which the line of Messrs. Mudge and Featherstonhaugh passes are therefore the opposite of those usually remarked in highland countries, while those of the line claimed by the United States are the same as are always observed in such regions.

This character of a table-land deeply cut by streams is well exhibited in the section of their "axis of maximum elevation" by the British commissioners. In that will be seen the mountains near the source of the Aroostook, Alleguash, and Penobscot on the one hand, and of the Tobique on the other, while the intervening space is occupied by a curve resembling an inverted arch, of which the St. John occupies the keystone. In a country of this character any line whatever would present the appearance of a succession of eminences, and might by as liberal a construction of the term as has been made by Messrs. Mudge and Featherstonhaugh be called highlands.

The sameness of this general character is broken only by a single chain of hills.[32] This is a prolongation of Mars Hill toward the north, and, being both of less height and breadth than that mountain, is hidden by it from the view of a spectator on Parks Hill. Mars Hill is itself an isolated eminence, and is in fact nearly an island, for the Presque Isle and Gissiguit rivers, running the one to the north and the other to the south of it, have branches which take their rise in the same swamp on its northwestern side. To the north of the Des Chutes the ground again rises, and although cut by several streams, and particularly by the Aroostook, the chain is prolonged by isolated eminences as far as the White Rapids, below the Grand Falls of the St. John, where it crosses that river. It may thence be traced in a northern direction to the Sugar Loaf Mountain, on the Wagansis portage, where it terminates.

To this broken chain belongs the elevation of 918 feet given by Messrs. Mudge and Featherstonhaugh to an eminence in the neighborhood of the Aroostook Falls. An accurate profile of so many of these eminences as fall in the line of the connected meridian is herewith submitted. This chain of eminences is not prolonged to the westward, as it is entirely unconnected with any other height aspiring to the name of mountain in that direction.