How list are defined ?

Originally, I put together a list of my favorite peaks in Hong Kong and also found on some websites other interesting peaks to ensure players could discover new spots everywhere in Hong Kong. I ended up with was a list of 100 peaks. Then first players suggested more peaks and I finally stopped at 125 so that climbing all the peaks is challenging but achievable. Recently, players wanted more and suggested secondary peaks and I created Hong Kong II. As of today, there's no plan to merge both challenges.

How list are defined ?