Which voice type is the lowest?

Explanation

A singer's voice has a vocal range. There exists the following ranges: coloratura soprano (the highest), soprano, mezzo-soprano, alto, counter-alto, counter-tenor, tenor, baritone and bass (the lowest). The basic vocal ranges are soprano, alto, tenor and bass.
Coloratura soprano, soprano, mezzo-soprano, alto and counter-alto are female voices, while counter tenor, tenor, baritone and bass are male voices.