shallowness

US /ˈʃæl.oʊ.nəs/
UK /ˈʃæl.oʊ.nəs/
1.

sự nông cạn

the fact of measuring only a short distance from the top to the bottom, or from where something is to the ground or surface:

:
Because of the shallowness of the water, we could see the fish in it very clearly.