a hot spring one has discovered that he/she wishes to keep secret from others, a secret hot spring

the depths of the mountains; someplace deep within a mountain

to discover, to find (e.g. an error in a book) / to find (e.g. something missing)

to discover, to find (e.g. an error in a book); to find (e.g. something missing)

Alternative form of 見付ける

secret; confidential

alternative spelling of 蕩蕩: spacious, grandiose; level and peaceful; gushing, surging, rushing; gentle; disordered, unconstrained

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend