It's doesn't have a huge gradient but it is undulating. My nearest on-road route is more down for a bit then a slow hill back. The "flat" route is totally flat.
I ran one of the 25 minute runs of week 6 or 7 of C25K round a resorvoir about 12 miles from where I live before I graduated, it was very flat and I am considering running a 5K there sometime in the future.
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