From the water-divide which separates the most eastern affluent of the Brahmaputra, eastwards to the deep gorges which enclose the most westerly branch of the upper Yang-tsze-kiang (here running from north to south), is a short space of loo m.; and within that space two mighty rivers, the Salween and the Mekong, send down their torrents to Burma and Siam.
It separates in the form of small rose-red crystals, which decompose on boiling with water.
The liquid is precipitated by alcohol, and the washed and dried precipitate is then dissolved in water and allowed to stand, when the salt separates in dark-coloured crystals.
The greater part of the state belongs to the western extension of the Brazilian plateau, across which, between the 14th and 16th parallels, runs the water-shed which separates the drainage basins of the Amazon and La Plata.
Its safety also was secured by the barrier of rugged mountains (7000 to 8000 ft.) which separates its district from the rest of Asia Minor.