If the actual crests of the excursions had been measured the figures in the second line would have been even larger.
In 1881 a treaty was signed which provided that the boundary line should follow the highest crests of the Andes forming the watershed as far south as the 52nd parallel,thence east to the 10th meridian and south-east to Cape Dungeness at the eastern entrance to the Straits of Magellan.
When the attempt was made to mark this boundary the commissioners were unable to agree on a line across the Puna de Atacama in the north, where parallel ranges enclosing a high arid plateau without any clearly defined drainage to the Atlantic or Pacific, gave an opportunity for conflicting claims. In the south the broken character of the Cordillera, pierced in places by large rivers flowing into the Pacific and having their upper drainage basins on the eastern side of the line of highest crests, gave rise to unforeseen and very difficult questions.
Along the Sierra Baguales, thence south and southeast to the 52nd parallel, crossing several streams and following the crests of the Cerro Cazador.
Rn, covers eastern France from the Mediterranean to the Vosges, from the Cvennes and the Plateau de Langres to the crests of the Jura and the Alps.
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