Jökulsárlón is a glacier lagoon located in southeastern Iceland It is known for its stunning ice formations and crystal-clear water. The ice in Jökulsárlón glacier lagoon comes from the Breiðamerkurjökull glacier, which is part of the Vatnajökull ice cap. The ice caves in Jökulsárlón are formed by the meltwater that runs under the glacier, creating an intricate system of tunnels and caverns. These ice caves are constantly changing due to the melting and shifting of the ice, so the experience of visiting them is unique every time.