Sable Island

Sable Island is the top of a huge sand bank (a "moraine") left by melting glaciers 18,000 years ago when sea levels were 100 metres lower than they are now. As sea levels rose, it became an island.

The sand bank is about 80 metres tall and 70 kilometres long. That makes it a bit taller than Citadel Hill in Halifax and longer than...well...most things.

Sable Island - the part above water - is only a tiny piece of a huge sand deposit.

Sea levels are lower during ice ages because so much water is frozen in glaciers.