N of n
The 'kilometre' group
The noun is a count noun indicating a unit of measurement. The noun group after of indicates the thing that is measured.
acre centimetre foot gallon gigabyte gram inch kilo kilobyte kilogram kilometre litre megabyte metre mile ounce pint pound terabyte ton tonne yard
The summer sun has thawed the top 30 centimetres of a soil that is frozen to a depth of hundreds of metres.
Bowen has kilometres of white sandy beaches on its doorstep.
I drink a litre of pure water every day.