In a couple of weeks my buddy (husband) and I will be doing a few dives on the UK's Jurassic coastline, in Swanage.
It's said if the vis (visibility) is good here you can often see seahorses, as they are doing well in the neighbouring bay at Studland.
British water is infamous for it's vis, and not always positively - where are some good dive sites globally to dive with seahorses?
Include in this, a depth of 25m (82 feet) or less, for shore dives only (around 15m (50 ft) from land).