Among these lavas is the "pipe" amygdaloid of which many blocks have been transported great distances down the Vaal river.
Flowing between steep banks, considerably below the general level of the country, here about 3000 ft., it receives, between the Vaal confluence and the Atlantic, a distance of more than 400 m.
In the neighbourhood of the Vaal, confluence, where the river passes through alluvial land, and at some other places, the waters of the Orange are used, and are capable of being much more largely used, for irrigation purposes.
Mission stations north of the 'Orange were established a few years later, and in 1813 the Rev. John Campbell, after visiting Griqualand West for the London Missionary Society, traced the Harts river, and from its junction with the Vaal followed the latter stream to its confluence with the Orange, journeying thence by the banks of the Orange as far as Pella, in Little Namaqualand, discovering the great falls.
It is built by the banks of a tributary of the Vet affluent of the Vaal, and is a trading centre for a large grain and pastoral district.
That Spion Kop, with Vaal Kranz and Pieter's Hills, are heights on the northern bank of the upper Tugela.
In a dispute between the Transvaal and the Orange Free State he decided (February 1870) that the Klip river and not the upper Vaal was the frontier stream.
The rest of the country is divided between the drainage areas of the Vaal and Limpopo.
The Vaal (q.v.) rises in the high veld in the Ermelo district not far from the source of the Komati and that of the Usuto tributary of the Pongola.
A broad ring of crystalline rocks (Swaziland schists) encircles the Transvaal except on the south, where the Karroo formation extends over the Vaal River.
The following subdivisions have been recognized by Molengraaff Karroo System, Transvaal System, Vaal River System, South African Primary System.
The conglomerates consist almost entirely of pebbles of quartz set in a hard 2 At the Standerton gauge on the Vaal in 1905-1906, a year of extreme drought, the total flow was 8,017,000,000 cub.
Potchefstroom, in the south near the Vaal (pop. 9348), is the oldest town in the Transvaal.
Klerksdorp (4276) is also near the Vaal, S.S.W.
Besides the Pretoria fields there are diamondiferous areas (alluvial diggings) in the Bloemhof district on the Vaal river north-east of Kimberley, and in other regions.
The principal collieries are those at Boksburg and at Brakpan, also on the East Rand, with a coal area of 2400 acres; at Vereeniging and Klerksdorp, near the Vaal; at Watervaal, 12 m.
At that time the region between the Vaal and Limpopo was scarcely known to Europeans.
The first party to cross the Vaal consisted of 98 persons under the leadership of Louis Trichard and Jan van Rensburg.
On returning to the Vet, Potgieter learned that a hunting party of Boers which had crossed the Vaal had been attacked by the Matabele, who had also killed Boer women and children.
After the Matabele peril had been removed, many farmers trekked across the Vaal and occupied parts of the district left derelict.
The first permanent white settlement north of the Vaal was made by a party under Potgieter's leadership. That commandant had in March 1838 gone to Natal, and had endeavoured to avenge the massacre of Piet Retief and his comrades by the Zulus.
This party instituted an elementary form of government, and in 1840 entered into a loose confederation with the Natal Boers, and also with the Boers south of the Vaal, whose headquarters were at Winburg.
At this time there were settled north of the Vaal about 5000 families of European extraction - about 40,000 persons, including young children.
The Sand River Convention of 1852 had not defined the western border of the state, and the discovery of gold at Tati to the northwest, together with the discovery of diamonds on the Vaal in 1867, offered Pretorius every inducement to extend his boundary.
Although to-day the great diamond mines are south of the Vaal River, the early discoveries of diamonds were made chiefly on the northern bank of the Vaal, near the site of the town now known as Barkly West.
The eastern boundary of the new territory was made to include the region between the Harts river and the Vaal, in which the diamond diggings were situated, but not the Bloemhof district.
Captain Elliot, one of the prisoners, who had been released on parole, was shot dead by Boers while crossing the Vaal, and Captain Lambert, another paroled prisoner who accompanied Elliot, was also shot, but escaped.
Brand had arranged, in the teeth of the strongest protests from Kruger, that the Cape railway should extend to Bloemfontein and subsequently to the Vaal river.
The Delagoa Bay railway being at length completed to Pretoria and Johannesburg, Kruger determined to take steps to bring the Rand traffic over The Netherlands railway Drifts began by putting a prohibitive tariff on goods from the Vaal river.
Not to be coerced in this manner, the Rand merchants proceeded to bring their goods on from the Vaal by wagon.
A rush of prospectors at once took place to the banks of the Orange and Vaal rivers, and resulted in considerable discoveries, so that in 1870 there was a mining camp of no less than 10,000 persons on the " River Diggings."
But towards the close of 1870 stones were found at Jagersfontein and at Dutoitspan, far from the Vaal river, and led to a second great rush of prospectors, especially to Dutoitspan, and in 1871 to what is now the Kimberley mine in the neighbourhood of the latter.
The River Diggings on the Vaal river are still worked upon a small scale, but the production from this source is so limited that they are of little account in comparison with the mines in the blue ground.
This is still more forcibly suggested by the remarkable eclogite boulder found in the blue ground of the Newlands mine, not far from the Vaal river, and described by T.
Save the Vaal river no frontier was indicated, and " boasting," writes Livingstone in his Missionary Travels, " that the English had given up all the blacks into their power.
The limit of concessions to the Boers had been reached, and Sir Charles Warren's force-4000 strong - had reached the Vaal river in January 1885.
In the north-west of the trunk railway are: Parijs, 1732, finely situated on the Vaal, and Vredefort, 759.
Deep. The alluvial deposits on the banks of the Vaal, N.E.
Coal-mines are worked in various districts in the north near the Vaal, notably at Vierfontein, and at Clydesdale, which lies a few miles south of Vereeniging.
The majority of the inhabitants appear to have been members of the Bechuana division of the Bantus, but in the valleys of the - Orange and Vaal were Korannas and other Hottentots, and in the Drakensberg and on the western border lived numbers of Bushmen.
Potgieter, who concluded an agreement with Makwana, the chief of the Bataung tribe of Bechuanas, ceding to the farmers the country between the Vet and Vaal rivers.