 The swirling motion of water and pebbles creates potholes in the gorge, spherical depressions in the rock.Gulf Hagas may have been created towards the end of the last ice age when an ice-damned lake gave way and sent huge volumes of water through the area, carving the Gulf.The Gulf Hagas Rim Trail passes through The Hermitage, one of the few remaining stands of virgin old growth forest in New England.