By boat from Portrush Harbour. The site is immediately off the south facing side of Castle Island.
Portrush Harbour offers free car parking above the harbour, public toilets in the harbour office and a slipway on the North Pier. There is a barrier to the harbour which is staffed during office hours, 7 days a week from April – September. Fees apply; for use contact Portrush Harbour Office: 02870822307 / 0788981860.
Nearest tank filling is Aquaholics in Portstewart (028 7083 2584)
- Swells are strong here.
- Lobster pots (with lines) are present.
- Concrete blocks are found on the seafloor.
The site is an area of rocky reef off the south side of Castle Island. A flat sandy area is found beneath the reef, with patches of gravel and occasional boulders. To the north east, there is a narrow gully found within the bedrock wall.
The reef area is dominated by dense kelp, predominantly sugar kelp Saccharina latissima and furbellows Sacchoriza polyschides and a diverse algal turf. The short faunal turf on the bedrock is characterised by hydroids and bryozoans. With distance away from the bedrock, the seabed transitions to fine sand and shelly gravel.
View all species records from this siteA link to the dive site location on the NBN Atlas Northern Ireland website, showing all species records from within a 1km boundary of the site centroid. Any new species records from the site submitted to Seasearch, iRecord, CEDaR Online Recording or iNaturalist will appear here
- In an emergency call 999 or 112 and ask for the coastguard.
- Follow VHF radio Channel 16 (156.8 MHz), the international distress frequency. Send a distress alert followed by ‘MAYDAY, MAYDAY, MAYDAY’ and ‘This is [boat name]’.
- Find nearest defibrillator (AED) here.
- Portrush Harbour Office: 02870822307.
- When navigating within the harbour/marina, use VHF Channel 12.
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