South Pacific Island

I huge mound of turd that when freshly deposited into a toilet piles up above the water level, much like the way the South Pacific islands were formed from lava piling up from undersea volcanoes.

This phenomena I more frequently occurs in the newer, low water usage toilets. As an added touch, you can plant a small flag on top of it to claim it as yours.

I just found a South Pacific Island in the crapper. It's still steaming.