1. Great Geysir, also known as Great Geyser, is located in the Haukadalur geothermal area of southwestern Iceland, about 100 kilometers east of Reykjavik. It is one of the world’s most famous geysers, and the first documented geyser to be known to Europeans. Great Geysir erupts hot water and steam up to 70 meters high, making it one of the largest natural geysers in the world. The geysir’s eruptions are infrequent and unpredictable, with intervals ranging from several hours to several years. However, there are other geysers in the area, such as Strokkur, which erupts every 5-10 minutes and is a popular attraction for tourists. The geothermal area also has mud pools, steam vents, and other thermal features. The name \"geysir\" actually comes from Great Geysir.
2. Great Geysir does not have a specific working time, as it is a natural phenomenon and its eruptions are unpredictable. However, the geothermal area is open to visitors year-round and admission is free. There is no phone number for Great Geysir.
3. The geothermal area is located about 100 km east of Reykjavik and can be reached by car or bus. The nearest town is Laugarvatn, which has a bus stop and a thermal spa. There is also a tourist center at the geothermal area with information about the facilities and the surrounding attractions. There are no tickets needed to see the geysers and thermal features of Haukadalur, but visitors are advised to stay on the marked paths and follow safety guidelines to avoid accidents.