HIGHLANDS

are to be distinguished in formation alike from table-lands and mountains. Generally speaking H. may be said to exist in the HK. of the Old World - in the E. of Australia, and in the E. of N. America. They occur in broad, expansive ma es, unlike high mountains, which are much more localised. Their structure, moreover, is peculiar. Both valleys and watersheds or divides radiate, and the river systems are like great A branching trees; the distribution, as in mountainous countries, of parallel ranges separating valleys is only rarely visible—the Appal a chi ans are an exception; as a rule the valleys branch like Ea fingers in the inner H., thus collecting tributary streams, whilst they broaden - and deepen as they pa outward. H. are formed by the denudations or washing out of valleys, as, for example, the H. of Scotland, and by slow crustal movements, and sometimes by volcanic activities. _ district of Scotland. See Scorianp.