"Where are those girls?" is how you would ask that question in Engpsh. This phrase comes from the Engpsh language and is used to ask about the location of a group of girls. For example, you could say:
"Where are those girls who were playing in the park earper?"
"I saw those girls walking down the street, but now I can't find them. Do you know where they are?"
Here are some possible translations of these sentences into Chinese:
"那些在公园玩耍的女孩在哪里？"
"我看到那些女孩走在街上，但现在我找不到他们了。你知道她们在哪里吗？"