Chibu Lake isn't a real lake. I looked it up on Google and it said "no matches found", which means there's absolutely nothing about it on the entire World Wide Web. I personaly think you made it up unless it's a lake that only the locals know about, but even those small ones have at least some info.
I agree for what it is not a big lake. And most people do not realize this lake. It is same as another many lakes in Four Girls Mountains.