Nauru has 30 kilometers (19 miles) of roads, of which about 80 percent are paved. The major road circles the island, while the others connect the phosphate mines with coastal settlements. The only rail facilities on Nauru are narrow-gauge and run 5.2 kilometers (3.2 miles) from the phosphate mines to a processing plant. Nauru has no port or harbor, but it does have a deep water anchorage and facilities for loading phosphate onto ships. Nauru operates its own airline, called Air Nauru, with 2 aircraft (Boeing 737s), based at Nauru's international airport. The airline connects Nauru with Australia and other Pacific and Asian countries. The government heavily subsidizes Air Nauru, and its future is questionable. Nauru has international telephone connections by satellite. The country is completely electrified and power is supplied by diesel generators, the fuel for which is imported.