"Whereabouts are you walking?"
Translation:Где вы ходите?
It's not incorrect, but it's very odd, at least in American English.
This translation, coupled with "having a rest" in a previous exercise, seems to indicate that there is a person from the UK doing some of these translations.
This particular translation is stylized and formal. Don't use it in the US, unless you want to seem a bit weird.
One thing that might explain the peculiar use of "whereabouts" is that "Where are you walking?" in American English means "Where are you walking to?", which is not what the Russian sentence asks (I believe you'd need to use куда). With "whereabouts", the question doesn't ask where you're walking to, but rather "in what area are you walking". The fact is that "Where do you walk?" asks this same latter question, and does so with much greater efficiency and accuracy.