в ванне

in the bathtub

→ в
phrase Uncommon #24,774
in the bathtub Specifically means inside the tub; “в ванной” usually means “in the bathroom.”
RU: Книга лежит в ванне.
EN: The book is in the bathtub.

Вода в ванне остывает.

The water in the bath is cooling.

В ванне.

In the bathtub.

— Такси-блюз (1990)

Я предпочитаю мыться в душе, а не в ванне.

I prefer to wash myself in the shower rather than in the bath.

Полгода назад один тип поскользнулся в ванне,..

Six months ago, some guy slipped in the bathtub...

— Двойная страховка (1944)

Не спи в ванне.

Don't fall asleep in the bathtub.