Oronsay is a tiny island, connected to Colonsay by a beach which is only accessible at low tide.
A 4-5 hour circular walk takes you over the crossing to see the priory and an RSPB sanctuary.
Compared to the other tidal islands I’ve visited (Burgh Island, St Michael’s Mount, Cramond Island) the walk to Oronsay was a long and not particularly enjoyable schlep across wet sand and standing water.
I’d love to say it was worth the walk, but I was so fed up I turned back as soon as I got to the waymarker. Sorry Oronsay! Another day perhaps.