Arêtes
They r called veins
A long, narrow , deep inlet of the sea between hills or mountains
A 21 foot boat refers to the length of the boat. There is not comparison between length and width. It could be narrow as on narrow boats or wide as in sea faring boats,
The width that is less than narrow is typically referred to as "slim" or "slender." In some contexts, terms like "tight" or "skinny" may be used as well. These descriptors indicate a width that is even more restricted than what is commonly considered narrow.
A light beam or beam of light is a narrow cone of light energy radiating from a small source. In optics, a ray is an idealized narrow beam of light.
cirques
It is called an isthmus.
an alley. A narrow passage between buildings or parts of different buildings is also called an areaway.
Narrow lines of colors with no light in between them are called dark lines. They are typically seen in the spectrum of light when certain wavelengths are absorbed or blocked.
A small narrow waterway between two pieces of land is called a strait.
it is called an isthmus
The passage between buildings is typically called an alley or a walkway. It is a narrow path that provides access between two structures.
The narrow neck of land between Nova Scotia and New Brunswick is called the Chignecto Isthmus.
A sharp ridge separating cirques is known as a "horn" or "arete." It forms as glacial erosion carves out steep valleys on either side, leaving a narrow, rugged ridge between the two cirques. This topographical feature is often characterized by its jagged peaks and steep slopes, making it a prominent feature in alpine landscapes. Horns and aretes are common in mountainous areas where glaciers have significantly shaped the terrain.
this is called an Isthmus
This would be called a fjord.
This is because it is a narrow boat