कहाँ से (kahā̃ se)
Example:
* आप कहाँ से हैं? (aap kahā̃ se haĩ?) - Where are you from?
Here are some other ways to say "Where from" depending on the context:
* किस जगह से (kis jagah se) - From which place
* कौन से स्थान से (kaun se sthaan se) - From which location
* किस देश से (kis desh se) - From which country
* किस शहर से (kis shahar se) - From which city
Remember that Hindi is a flexible language, and the best way to say "Where from" will depend on the specific context.