Menai Strait
The strong tidal flow in the Menai Strait creates small whirlpools, hence the name the "Swellies". In olden times, access by rowing boat was restricted by the tides but nowadays modern boats can access anytime. Mains water and electricity were installed in 1997. Pumping systems mean the two houses no longer flood. Due to the large tidal range of the Menai Strait the size of the island varies between and .