To us inhabitants of "Wilhelmsruh" this sledging slope was known as "Chimborasso". Perhaps its name changed to "Kilimandzaro" because it lost in height over the years.
For Zacisze / Zalesie inhabitants it was mostly known as "Cymbo" or "Cymboras", which is exactly the same as you have pronounce it. However to which inhabitants you refer - pre war or post war, I'd like to know.