Hazrat Idrees (A.S) met with Holy Prophet (SAW) on the ________ heaven?

Explanation

During the Mi'raj, Prophet Idris (A.S.) was encountered in the fourth heaven. The commonly memorised sequence places Adam in the first, Jesus and Yahya in the second, Yusuf in the third, Idris in the fourth, Harun in the fifth, Musa in the sixth and Ibrahim in the seventh.