Where is the oil pan located?

Where is the oil pan located?

My van is about 10,000 over due for an oil change and my parents want me to do it myself (i'm 16). I was wondering where the oil pan on it is. I looked the other day and found the oil filter, oil pan, and trans pan, but I'd rather not accidentally start draining out my trans fluid. I'm relatively good with cars, I've just never changed the oil in this vehicle before. The van has a 3.3L v6 driving the front wheels if that matters