As in the previous sections, here there are many small rivers and lakes, but few large ones. Their size and quantity reflect the relief of the earth’s surface; they should be in its valleys and lowlands, and in what proportions began to become clear only in the last quarter of the twentieth century, which is described in Chap. 8 . Floods are also closely related to topography (and precipitation), so it is natural to consider all this in one point. The areas of lakes, of course, should depend on the level of precipitation and processes of evaporation, which is determined by the climate of the region. Size distributions for lakes and rivers are presented in Turcotte’s book (Turcotte DL (1997) Chaos and fractals in geology and geophysics, 2nd edn. Cambridge University Press, Cambridge, 398 pp) in figures 8.3 and 8.4. They are well described thereby power laws. For rivers, the cumulative length distribution N (≥ l) proportionally l−n, where n = 1.9, and for lakes cumulative distribution by area. Kolmogorov, not processed purely by the nature.