Plan E.
To these two main aspects the reader must again admit considerable modifications, the first of which concerns the French side.
Plan F.
This Northern slope and its valleys, of which the sketch map over page indicates the general arrangement, may be divided into two sections: the first a western section, the second an eastern one, and these two are separated at A-B by a division roughly corresponding to the “fault” between the two axes, which, as we have seen, determine the lie of the range.
From the first, or western axis, descend with a regular parallelism, eight valleys. Each valley bifurcates in its higher part into two main ravines, and a whole system of minor streams, spread over an indefinite number of tortuous dales and gullies, attach to each valley.
There is a mark or limit for each of these western French valleys, which is the spot where it debouches upon the open country. Thus the Gave d’Ossau falls into the Gave d’Aspe at Oloron; nevertheless the two valleys must be regarded as separate, because the meeting of the two streams takes place in the open plain. On the other hand the valley of Baigorry, and the neighbouring valley of St. Jean, though containing two large separate streams, must be treated as one system, because these streams meet at Eyharee near Ossés, and the open plain is not reached before a point some miles further down beyond Canbo.