The most famous rock formation in the Arnarstapi area is Gatklettur, or Hole Rock. The name is obvious as there is a giant hole through the rock, which looks stunning on pictures when the waves crash through it, and even more breathtaking in person as you can gaze out to sea whilst listening to the stillness surrounding you. The seaside and the cliffs between Arnarstapi and the nearby hamlet Hellnar were made a Natural Reserve in 1979, and are now a part of Snæfellsjökull National Park.
Mount Stapafell is a pyramid-shaped 526 m high palagonite mountain and a volcano right next to Snæfellsjökull glacier and volcano.