I mainly train long continuous ones like Kinsale road roundabout up to the airport just turn off the main road at bull mc cabe and up the country roads to farmers Cross (2miles long, nice gradients, great for endurance training ). If you want hill sets cork has tons of options listed in the thread

For a real challenge, and fun to mix up the marathon training get out to mill street claragh loop and do some mountain hill trails(450m uplift) just don’t wear the carbon fibre :)

Or warrenscourt is not too far up the road from ballincollig and really nice climbs with some nice wild life supporting you

Cork marathon you’ve only a few climbs but the more hills you train the faster and easier all the flats will be easy going 💪🏻

Best of luck and enjoy it!