에 앉아

sit at/on/in

→ 에
phrase Very common #1,245
sit at/on/in 에 marks the place where someone is sitting; the exact English preposition depends on the location.
KO: 의자에 앉아 책을 읽어요.
EN: I sit in a chair and read a book.

왜 거기에 앉아 있니?

Why are you sitting there?

— 스즈메의 문단속 (2022)

"들어와서 불가에 앉아 토끼 아저씨가 말했죠"

“Come on in and sit by the fire,” Uncle Rabbit said.

— 가장 따뜻한 색, 블루 (2013)