The term 'ravine' is used to refer to a type of geographical feature that is characterized by the formation of a channel or a depression in the ground caused mainly by the continuous or sudden erosion of a water course (a river, a spring, etc.). The ravine is always irregular and its size or extension can vary over time according to how the river bed or the watercourse that affects it also varies. The ravines are also usually dangerous spaces for man and animals since the ground is not firm and can cause landslides or precipitous falls.
The ravine is usually moderate in size but this does not apply to all cases, there are exceptions to the rule. In some cases, the ravine takes a definitive shape from the consolidation of the territory in certain parameters. But in others, the ravine can be formed by a sudden situation and vary when this situation disappears or subsides. The ravine always supposes a fall of a more or less important height, the end of the earth's surface and the precipice (which on certain occasions can be less). In most cases, the fall is quite steep since the ravine being caused by erosion, this decreases the height of the land and leaves high walls of earth on its sides.
It is important to try to fill the ravine as much as possible in order to avoid serious accidents for those who must cross it. At times, the ravines are unrefillable as the lower ground space is very spacious, almost like a small valley that can stretch for miles. However, in the case of small ravines, of a couple of meters, filling them is always advisable.
