Sneaker waves: At beaches such as Reynisfjara there are often very strong currents which can result in sneaker waves. Such waves are so powerful that they sweep one into the ocean when coming too close.
Geothermal areas: The heat at geothermal active areas is often around 100°C (212 Fahrenheit) and therefore it is important to avoid contact with the hot water and stick to assigned trails.
Slippery trails: During winter, trails are often icy, in particular near waterfalls. Therefore, it is recommended to use ice cleats or ice grips.
Travellers must follow the instructions that are given to them by warning signs and respect rails and fences because they are there for a reason.