About definite article "The"

Nidhi mam ne boli english grammar ki class mein ki Himalayas ke samne “The” nahi baith ta hain lekin “Shyamalendu Chanda” ki written book English tutor mein mene poda tha ki Himalayas ke samne"The" baith ta hain, that’s why I’m confused, PLZ clarify my confution