Rapanui Rock

Shag Rock, also known as Rapanui, is a notable sea stack that marks the entrance of the Avon Heathcote Estuary near Christchurch, New Zealand. It is a prominent landmark for navigators at sea as well as travelers on the road to Sumner. The rock stands close to the southern shore just above the low tide level. In the February 2011 Christchurch earthquake it shattered and the remains, which are still easily seen from the road, have, with dark humour by some locals, been called "Shag Pile" (a pun referencing the style of carpet).

Although no longer used by shipping, the estuary is accessible as far as Ferrymead using shallow draught vessels up to about 30 tons if the bar is crossed in favourable wind, sea and tidal conditions. The shipping channel into the estuary lies to the northern side of the rock.