2 km
Rena
400km
That would depend on how far out to sea you are off the coast of the UK.
It was about 11 miles or 18 kilometres off the south coast of Ireland.
Fort Sumter has a 30 minute ride from the coast
it crashed into astrolabe reef of the coast of papamoa (new zealand)
3,500
Beaufort Sea is off the North, far North, West Coast.
400 kilometers
Depend on location, 3-250 miles
in a place in the far east off the coast of china
Trinidad is 6.8 miles off the northeast coast of Venezuela, South America. Trinidad is 1,841 square miles in area.