'An hour's hard walking brought us to the foot of rugged Tongwe, the Great Hill. Ascending the flank of the N. Eastern spur, we found ourselves at 8 A.M., after five or six bad miles, upon the chine of a little ridge...Thence, pursuing the rugged incline, after another half-hour we entered the 'fort', a crenellated, flat-roofed, and whitewashed room, 14 feet square, supported inside by smooth blackened rafters. It was tenanted by two Baloch, who figure on the muster-rolls as 20 men. They complain of loneliness and of the horrors: though several goats have been sacrificed, an obstinate demon still haunts the hill, and at times the weeping and wailing of distressed spirits makes their blood run chill from their hearts.
Tongwe is the first offset of the massive mountain terrace which forms the Region of Usumbara; here, in fact, begins the Highland block of Zangian and equatorial Africa, which culminates in Kilima-njaro and Doenyo Ebor, or Mount Kenia. It rises abruptly from the plain, and projects long spurs into the river valley, where the Panga-ni flows noisily through a rock trough, and whence we could distinctly hear the roar of the celebrated waterfall' (Zanzibar, II, pp. 171-2)