A narrow piece of land that joins 2 larger land areas and separates 2 bodies of water.

A pool of shallow water linked to the sea by an inlet.

A group of islands.

Tall, steep-sided towers of rocks. Smaller than a mesa.

A sheltered body of water where ships anchor and are safe from the winds and waves of storms at sea.

A coral reef in the open ocean that appears as a low, ring-shaped island or ring of islets.

The line of 0 degrees longitude, the starting point for measuring distance east and west around the globe. It runs through Greenwich, England.

A hot spring through which jets of water and steam erupt.

Land along the sea.

The distance east or west of the Prime Meridian.

A large, relatively flat area that stands above the surrounding land.

A wide strait or waterway between 2 land masses that lie close to each other.