It is a cirque. Some contain what are called 'tarns', lakes of water that accumulates in the basin formations.
This is called an ARETE
Glacial erosion produces U - shaped valleys.
u shaped valley..
Glacial valleys (also known as glacial troughs) tend to be u-shaped, as opposed to river valleys which are v-shaped.
Aretes
Fjords.
arete-steep sided ridge corries-hollows containing small glaciers ribbon lakes-formed by glacial retreat glacial trough-steep flat bottomed valleys hanging valleys-valleys formed by tributary glaciers truncated spurs-cliff like edges of a valley pyramidal peak -mountain with 3 sides
Aretes?
Sharp narrow ridge separating two glacial troughs (U-shaped valleys), or corries.
River/stream cut valleys are 'V' shaped while Glacial valleys are 'U' shaped.
ALLSLWE
cause yo mama said so