Its gradient
either side of an inflection point
river bank..
valley
A hill with a steep side is called a bluff. Bluffs can be found along coastlines or riverbanks, and they often offer scenic views due to their height and steepness.
it is a floodplain
The side of a channel is referred to as a "bank." It is the raised edges that contain and direct the flow of water within the channel.
The floodplain is an area of flat land found on either side of a river that usually becomes wider as the river nears its mouth. A low watery formation of land at the mouth of a river is called a delta.
A river that deposits fertile soil on either side of its banks during a flood is called an alluvial river. The floodwaters carry sediments and nutrients, enriching the soil along the riverbanks and making it highly fertile for agriculture.
The floodplain is an area of flat land found on either side of a river that usually becomes wider as the river nears its mouth. A low watery formation of land at the mouth of a river is called a delta.
leeward
The sides are known as the river bank or river banks.
The slope of the cut and fill alongside a road is called the "embankment slope" or "borrow slope." It refers to the graded side slopes created when soil is excavated (cut) and used to build up an area (fill). Proper design of these slopes is crucial for stability and drainage, ensuring safety and longevity of the roadway.