Surveys in British Central Africa were taken up in 1894; a survey of Lake Nyasa, by Lieut.
In December 1901 the mullah was, however, once more raiding in the neighbourhood of Burao, and in May Wars with 1902 Colonel Swayne led another expedition against the Mullah him, the Somali levies being strengthened by the 2nd Mahomme dKing's African Rifles, consisting of Yaos from Nyasa- Abdullah.
The stream of supply came mainly from the southern Nyasa districts by three or four routes to Ibo, Mozambique, Angoche and Quilimane.
It was believed in 1862 that about 19,000 passed every year from the Nyasa regions to Zanzibar, whence large supplies were drawn for the markets of Arabia and Persia up to 1873.
It is said that, whereas io,000 slaves formerly passed the southern end of the Nyasa every year, in 1876 not more than 38 were known to have been conveyed by that route.
After the establishment of the Zulu military ascendancy early in the 19th century various Zulu hordes successively invaded and overran a great part of east-central Africa, as far as and even beyond the Lake Nyasa district.
Above the sea, and occupies the southern end of the great central rift-valley, which terminates suddenly at its southern point, the line of depression being represented farther south by the more easterly trough of Lakes Nyasa and Rukwa, from which Tanganyika is separated by the Fipa plateau, composed of old granitoid rocks; though even here traces of old valley-walls are said by Dr Kohlschiitter to exist.
The greater part of the trade with Tanganyika is done by the African Lakes Corporation by the Shire-Nyasa route, but the Germans have opened up overland routes from Dar-es-Salaam.
Across the plateau between Lakes Tanganyika and Nyasa, in its southern section following the course of the river Songwe.
Thence it goes down the middle of Nyasa as far as 11 ° 30' S.
This plateau, considerably tilted from its horizontal position, attains its highest elevation north of Lake Nyasa (see Livingstone Mountains), where several peaks rise over 7000 ft., one to 9600, while its mean altitude is about 3000 to 4000 ft.
As already indicated, the southern half of Victoria Nyanza and the eastern shores, in whole or in part, of Lakes Kivu, Tanganyika and Nyasa, are in German territory.
Lake Rukwa north-west of Nyasa is presumably only the remnant of a much larger lake.
Of inland river systems there are four - one draining to Victoria Nyanza, another to Tanganyika, third to Nyasa and a fourth to Rukwa.
Of the streams entering Nyasa the Songwe has been mentioned.
The Ruhuhu, which enters Nyasa in 10° 30' S., and its tributaries drain a considerable area west of 36° E.
In the vicinity of Lakes Nyasa and Tanganyika, sandstones and shales of Lower Karroo age and yielding seams of coal are considered to owe their position and preservation to being let down by rift faults into hollows of the crystalline rocks.
The rift-valley faults continue down the depression, marked by numerous volcanoes, in the region of the Natron Lake and Lake Manyara; while the steep walls of the deep depression of Tanganyika and Nyasa represent the western rift system at its maximum development..
They are spread over the central plains, and have for neighbours on the south-east, between Nyasa and the Rufiji, the warlike Wahehe.
The Wangoni (Angoni), a branch of the Ama-Zulu, are widely spread over the central and Nyasa regions.
Wiedhafen is on the east side of Nyasa at the mouth of the Ruhuhu, and is the terminus of the caravan route from Kilwa.
Good roads for foot traffic have been made from the seaports to the trading stations on Lakes Nyasa, Tanganyika and Victoria.
Though the revolt spread over a very large area, the chief centre of disturbance was the region between Nyasa and the coast at Kilwa and Lindi.
Besides a number of settlers a Roman Catholic bishop and a party of four missionaries and nuns were murdered in the Kilwa hinterland, while nearer Nyasa the warlike Wangoni held possession of the country.
The restless Arabs of Zanzibar had since 1857 steadily advanced Zanzibar influence to Tanganyika, Nyasa, and even through the Masai countries to the north-east coast of Victoria Nyanza and the " back door " of Uganda.
- Missions: Algeria, Sahara, Nyasa, Victoria.
Short of Lake Nyasa with its 350 m.
The disablement of the only German boat on Lake Nyasa by Comm.
Suess as far south as Lake Nyasa.'
Of Lake Nyasa, cut by 35° 20' E., and lying between 15° and 15° 35' S.