The areas most likely to have problems of this nature are those having high concentrations of uranium in the underlying rocks.
(The areas most likely to have problems of this nature; are; those having high concentrations of uranium in the underlying rocks) (those; having; high concentrations of uranium in the underlying rocks)
The areas most likely to have problems of this nature those
are having
those having high concentrations of uranium in the underlying rocks
high concentrations of uranium in the underlying rocks