Colgrain Equestrian Centre is situated on the A814 between Helensburgh and Cardross on the shore side of the road.
https://www.google.co.uk/maps/place/Colgrain+Equestrian+Centre/@55.985674,-4.691692,12z/data=!4m6!3m5!1s0x4889ac49ff0c4471:0x443fa9c9febbf390!8m2!3d55.9857613!4d-4.6913533!16s%2Fg%2F1txy1x_0?hl=en&entry=ttu