Barry Docks by Friar's point. It had been a port in Medieval times. The island was about long and wide, with a height of above mean sea level. The mainland slopes up to the north, so the sound was well sheltered from the wind. No rivers or streams ran into the sound. The Bristol Channel is known for the range of its tides. During normal spring tides there is a range in water level of , and during normal neap tides a range of but tides can peak at around in which case sea water flows into the dock over the top
International Convention Relating to Intervention on the High Seas in Cases of Oil Pollution Casualties International Convention Relating to Intervention on the High Seas in Cases of Oil Pollution Casualties International Convention Relating to Intervention on the High Seas in Cases of Oil Pollution Casualties 1969 (INTERVENTION 1969) is an international maritime convention affirming the right of a coastal State to "take such measures on the high seas as may be necessary to prevent, mitigate or eliminate grave and imminent danger to their coastline or related interests from pollution or threat of pollution of the sea by oil, following upon a maritime casualty or acts related to such a casualty". The 1967 Torrey Canyon disaster