which side
No estás completamente seguro de qué lado de la valla es un sueño.
You're not entirely sure which side of the fence is a dream.
Depende de qué lado del cristal esté.
It depends on which side of the glass you are on.
Hula, which side are you on?
— Los ilusionistas 3: Ahora me ves, ahora no (2025)
Si estamos en la India, ¿en qué lado estará América?
If we are in India, on which side would the Americas be?