Here's why:

* Rivers flow from higher to lower elevations: This means they have to travel across the land to reach their destination (usually the sea or another river).

* Rivers carve out valleys and channels: Over time, the water flow of rivers can erode the land, creating valleys and channels that define the landscape.

* Rivers are essential to life: They provide water for drinking, agriculture, and transportation, so they are often found in areas with human settlements.

Therefore, it's safe to say that rivers are a common feature on the land, and they play a significant role in shaping the landscape.