flying from the edge of the HKIA runway to the end of the suspension bridge is already 15 KM.
perhaps you could use google map to show us what the route that turns over the harbor looks like if you couldn't find a copy.
from your description, this is what I imagined the route would look like.
or is it a full circle like this:
Cuts through Sa Tin and Kwai Chung like I've mentioned, aren't exactly downtown.
mostly over water.