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Tofua is a volcanic island in Tonga, about 100 miles (161 km) north of the main island. Its sides rise steeply to the rim of its caldera, which is partially filled by a crater lake roughly 1,600 feet (500 m) deep. The entire island is a national park, containing many species of unique birds and the largest area of undisturbed Tongan tropical moist forests in Tonga.