detail from krafla volcanic area with boiling mudpots

activity area attraction boiling bubble color contrast countryside crater crust dangerous detail dramatic field force gas geological geology geothermal geothermic heat hell hole hot hverir iceland icelandic krafla landmark landscape mudpots multicolored namafjall natural nature nordic scenery scenic smell soil steam steaming stinking sulfur sulphur summer thermal tourism tourist travel view vista vivid volcanic volcanism volcano