The map appended to this work may be said to form the most complete chart of the interior of the North Island as yet published. Up to the present time the extensive territory embraced by the King Country has, owing to the obstruction of the natives, never been surveyed, and consequently many of its remarkable physical features have remained unknown, the existing maps of this part of the colony being mere outlines. As, therefore, considerably more than half of the country traversed was through a region which was, to all intents and purposes, a _terra incognita_ from the commencement of my journey, I adopted a system of barometrical measurements and topographical observations, and thus secured a supply of valuable material, which I mapped out from day to day, while the names of mountains, rivers, valleys, and lakes were obtained from the natives by the skilful assistance of my interpreter, who was at all times unceasing in his endeavours to carry out this part of the work with accuracy.
The table of altitudes of the various camping-places and stations of observation throughout the country explored will be found to be of considerable interest and importance. By these results the conformation of a large portion of the island may be arrived at. Thus, beginning at Tauranga, and taking that place at ten feet above sea-level, it will be seen that the land rises rapidly from the coast-line for a distance of about twenty miles, when, at the Mangorewa Gorge, it attains to an altitude of 1800 feet; from that point it falls towards the South until the table-land of the Lake Country is reached, when, at Lake Rotorua, it has an altitude of 961 feet. From the latter place, still going southward, the table-land rises with an elevation varying from 1000 to 1500 feet, until it falls towards the valley of the Waikato, when at Atea-Amuri it is not more than 650 feet above the level of the sea. Further along it gradually rises until it reaches Oruanui, some fifteen miles distant, where an altitude of 1625 feet is attained, until the country again falls to the extensive table-land of Taupo, where over a large area it maintains an elevation varying from 1000 to 1400 feet, the great lake itself standing at an altitude of 1175 feet. Southward of Lake Taupo the Rangipo table-land varies from 2000 to 3000 feet, until it falls towards the South Coast, giving an altitude at Karioi, on the Murimotu Plains, of 2400 feet. Westward of this point the country falls gradually to 560 feet to the valley of the Whanganui, and from that region going eastward to the Waimarino Plains it attains to an elevation of 2850 feet in a distance of about thirty miles. Northward again along the western table-land of Lake Taupo it varies in height from 1000 to 2420 feet, until the Takapiti Valley is reached, where it is only 900 feet. In the Te Toto Ranges an altitude of 1700 feet is attained, until at Manga-o-rongo, a deep basin-like depression in the valley of the Waipa, the land is not more than 200 feet above sea level.
