Woman in the Dunes (1964)

 Woman in the Dunes (1964) 

An amateur entomologist searching for insects by the sea is trapped by local villagers into living with a mysterious woman who spends almost all her time preventing her home from being swallowed up by advancing sand dunes. The woman and the trapped man begin a strange and erotic relationship that stretches over years, as the man's hope for escape dims.

(IMDB Vince Mattaliano)