Here are the maps that can give you the main idea about geographic location of Kamenets-Podolsky.

Here you can see Ukraine and Kamenets Podolsky (Kam'yanets'-Podil's'kyy) on it.

This is Khmelnyts'ka oblast (region) with the capitol Khmel'nyts'kyy. As you see Kamenets is on the south.

And finally the area surrounding Kamenets and its outskirts. As you can see the city is very close to Dnister ( Dnestre) river, one of the largest rivers in Ukraine.