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NYASA

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Originally appearing in Volume V19, Page 929 of the 1911 Encyclopedia Britannica.
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NYASA , the third in See also:

size of the See also:great lakes of Central See also:Africa, occupying the See also:southern end of the great rift-valley See also:system which traverses the eastern See also:half of the See also:equatorial region from See also:north to See also:south. Extending from 9° 29' to 14° 25' S., or through nearly 5° of See also:latitude, the See also:lake See also:measures along its See also:major See also:axis, which is slightly inclined to the See also:west of north, exactly 350 m., while the greatest breadth, which occurs near the See also:middle of its length, between 11° 30' and 12° 20' S., is 45 M. In the See also:northern and southern thirds of the length the breadth varies generally from 20 to 30 ni., and the See also:total See also:area may be estimated at I1,000 sq. m. The lake lies at an See also:altitude of about 1650 ft. above the See also:sea. The sides of the valley in which Nyasa lies, which are somewhat irregular towards its southern end, take a decided See also:character of See also:fault scarps in the northern third, and are continued as such beyond the northern extremity. Apart from the See also:recent See also:alluvium on the immediate shores, the lake lies almost entirely in See also:granite and See also:gneiss formations, broken, however, by a See also:band of horizontally-bedded sandstones, which cuts the axis of the lake in about I0° 3o' S., the See also:flat-topped, terraced See also:form of the latter contrasting strangely with the jagged or rounded outlines of the former. Near the margin, overlying the sandstones, there are beds of See also:limestone with remains of recent molluscs, pointing, like the raised beaches which occur elsewhere, to an upward See also:movement of the coasts. Lacustrine deposits up to 700 ft. above the See also:present lake-level have been discovered. Geologically, the lake is believed to be of no great See also:age, a view supported by topographical See also:evidence. The See also:depth of the lake seems to vary in accordance with the steepness of the shores, increasing from south to north. The greater See also:part of the northern half shows depths of over 200 fathoms, while a maximum of 430 fathoms was obtained by Mr. J.

E. S. See also:

Moore in 1899, off the high western See also:coast in about 11° 40' S. A more See also:complete See also:series of soundings, however, since made by Lieut. Rhoades, and published in the See also:Geographical See also:Journal in 1902, gives a maximum of 386 fathoms off the same coast in II° to' S. The lake receives its See also:water-See also:supply chiefly from the streams which descend from the mountains to the north, all the See also:rest becoming very small in the dry See also:season. Like other lakes of Central Africa it is subject to fluctuations of level, apparently caused by alternations of dry and wet series of years. At the north-western end is a See also:plain of great fertility, traversed by the Kivira, Songwe and other streams, rising either among the volcanic masses to the north or on the western See also:plateau. Just north of ta° S. on the See also:delta of the Rukuru, is the See also:British station of Karonga, the northern See also:port of See also:call for the lake steamers, though with. but an open roadstead. Southwards the plain narrows, and in about tor S. the See also:sandstone scarp of See also:Mount See also:Waller rises sheer above the indentation of See also:Florence See also:Bay, the high western plateaus continuing to fall steeply to the water in wooded cliffs for more than 8o m. In this stretch occur the See also:land-locked bays of Ruarwe (II° 5' S.) and Nkata (11° 36' S.), and the mouth of the Rukuru (to° 43' S)., which drains the plateau from south to north. At Cape Chirombo (I 1 ° 4o' S.) the coast bends to the west, and soon the plateau escarpments recede, and are separated from the lake along its southern half by an undulating plain of varying width.

In I I ° 56' S. is the British station of Bandawe, and in 12° 55' that of Kota Kota, on a lake-like inlet, forming a sheltered See also:

harbour. A little north of the latter the Bua See also:river, coming from a remote source on the upper plateau, enters by a projecting delta. At Domira Bay, in 13° 35', the coast turns suddenly See also:east, contracting the lake to a comparatively narrow See also:neck, with the British stations of Fort Rifu on the west, and Fort Maguire, near the headland of Makanjira Point, on the east. Beyond this the lake runs southwards into two bays separated by a granitoid See also:peninsula, off which See also:lie several small rocky islands. On this peninsula was placed the See also:mission station of Livingstonia, the first to be established on the shores of Nyasa. From the extremity of the eastern bay the See also:Shire makes its exit to the See also:Zambezi. On the eastern See also:side the plateau escarpments keep generally See also:close to the lake, leaving few plains of any extent along its shores. The See also:crest of the eastern water-See also:shed runs generally parallel to the See also:shore, which it approaches in places within 20 m. From the north point to to° 3o' S. the coast is formed by the unbroken See also:wall of the See also:Livingstone or Kinga range, rising where highest (9° 41' S.) fully 6000 ft. above the water. On this coast, on a projecting See also:spit of land, is the See also:German station of Old Langenburg, some to m. from the northern extremity. In lo° 3o' the plateau is broken by the valley of the Ruhuhu, the only important stream which enters the lake from the east. The formation is here sandstone, corresponding to that of Mount Waller on the opposite shore.

Just north of the Ruhuhu is the German station of Wiedhafen, on an excellent harbour, formerly Amelia Bay. South of the Ruhuhu the wall of mountains recedes somewhat, and the See also:

remainder of the eastern shore shows a variation between rocky cliffs, marshy plains of restricted area and See also:groups of See also:low hills. In 11° 16' is the deep inlet of Mbampa Bay, offering a sheltered See also:anchor-age. South of it the coast forms a wide semicircular bay, generally See also:rock-See also:bound, and ending south in Maio Point (I2° to' S.), off which are the largest islands the lake possesses, Likoma and Chisamulu, the former measuring about 4 m. by 3. In the southern half the coast is highest in about 13° to' S., where the Mapangi hills rise to 3000ft. Nyasa, reached in 1859 both by See also:David Livingstone (from the south) and by the German traveller Albrecht See also:Roscher (from the east), was explored by the former to about >°, and to its See Proc. R.G.S. (1883), p. 689; Geogr. Journal, vol. xii. p. 58o; J. E.

S. Moore, ib. vol. x. p. 289, and " The See also:

Geology of Nyasaland," by A. R. See also:Andrew and T. E. G. See also:Bailey, with See also:note on fossil See also:plants, See also:fish remains, &c., by E. A. N. See also:Arber and others and bibliography in vol. 66 of Quart.

Jnl. Geog. Society (May 1910). (E.

End of Article: NYASA

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