I'm going to use technical anatomical terms here.
The anatomy down there generally features two holes. A vagina, and a urethra. The urethra is where urine comes out, and it is generally a rather small hole, not necessarily that easy to see. The urethra is positioned closer to the clitoris (so one might consider it "in the front" and the vagina "in the back"), basically inbetween the clitoris and the vagina. The urethra and vagina aren't very far apart. It's unlikely that you pee from the vagina, unless somehow the urethra is in the vagina or you have some manner of fistula (basically an opening between two parts of the body that aren't supposed to be connected, causing things to leak across where they shouldn't - some people have vaginal/anal fistulas for example).
Not sure if it would be permissible per board rules to link it directly, since it does contain genital nudity, albeit in a medical sort of context. But if you go on Wikipedia, the page for "vagina" has all the parts labelled.
It's not a really weird question, by the way. The fact that in some cultures the human body is taboo is the weird thing. People should be able to ask questions/have discussions about how the human body works.