Nagatoro (長瀞) is a nice and relaxing place in
Saitama prefecture (埼玉県), located at the north of
Chichibu City (秩父市). The name
Nagatoro is composed by two ideograms: 長(なが), which means "
long", and 瀞(とろ), which indicates a "
pool in the river". The meaning of the second ideogram, in particular, can be easily understood by seeing that it is composed by water (水, often indicated as 氵in compounds) and quiet (静).

And in fact the river was really calm and quiet. Nice, isn't it?