NILE is almost certainly right but is much more awkward to parse. Nile is certainly a River (and a lake) but there were several ideas put forward as to the wordplay- none being entirely satisfactory
Thanks. Yes, but I am not sure where the little comes in then (a little bit of the word fIEld?) and why the I and E are set before and after the L.
E is used as the symbol for a field (electromagnetic I recall) but that doesn't fully explain it either