Rain, especially in the north and west of La Palma, is more frequent than is often expected. Generally, rain itself is no more than a minor inconvenience, but in the case of heavy downpours, several factors should be borne in mind. The first is that water starts flowing down the ravines, which are otherwise dry, and thus paths running along their beds should be avoided and walkers are advised to keep well away. The second is that rain causes landslides, and rocks of different sizes can become dislodged. This can easily be appreciated along roads, where stones may be seen which have rolled down the slopes. On path sections running at the foot of crags and vertical rock faces, extreme caution is required in such cases, and, if possible, such places should be avoided. The third consideration is that, once periods of heavy rain have ended, some paths may deteriorate simply as a result of erosion, although they are usually promptly repaired again.