Alternative Name(s):  Horseshoe reef and Anchor reef because of the anchor hanging off the wall. 


Travel directions: Leaving Glasgow on the A82 turn left at Tarbet onto the A83, through Arrochar and over the rest and be thankful,  turn left onto the A815, from this junction its 8.7 miles to the A886 then for 4 miles to the turnoff for the B8000 then for 9.8 miles to Thirteen-mile reef. ( Half a mile past Gortein point and just passed triple reef) At Thirteen mile reef the telephone pole at the side of the road has a No 29 on it. Google map


Parking directions:  Park in the passing place, leaving plenty room for cars to pass.(see picture below)


Distance from Glasgow: 50.5 miles 

Lat & Long: N56.039604 W-5.293683

Tides: Tide tables

Depth: 40m

Site entry/exit: Walk through the gap in the Bushes as in the picture below and down the rocks to enter the water. 


Underwater directions: head straight down to 22m and turn right until you come to the wall. Wall runs down to about 36m where it turns into a boulder slope we stopped at 40m. There is a nice big mushroom anchor and chain that hangs over the wall at about 25m.

Site Hazards: Can be a long swim back to shore if following it all the way down. Entry and exit can be tricky if there is a bit of a swell. If there is a flood or ebb tide you have to work hard to stay on the reef. 

Suggested experience: Experienced sport diver 

Nearest  phone: Creggans Inn

B+B: Creggans Inn

Mobile Network service: O2 Mobile good Orange (in places) 

Other comments: Often mistaken for triple reef.

Air & Nitrox fills:  Aquatron  Splashports


Pub: Creggans Inn

Created by:  John Nicolson  

Date: 31/10/06 

Revision: 4  

Thanks To:  

Surface Photos: Utube

Underwater photos: By John Nicolson


Underwater map/Sketch:  To follow 

Dive Report: