然迄 is read as さまで (samade) and means so much.
さまで
samade
しかるがゆえに
as such
さもないと
otherwise
しかるうえは
now that it is as such
さりげ
like that
さこそいえ
be that as it may
さしったり
here it comes
さあり
it is so
さあらぬ
casual
しか
さ
so
ぜん
-like
しぜん
nature