Gangkhar Puensum is the highest mountain in Bhutan and the highest unclimbed mountain in the world, with an elevation of 7,570 metres (24,836 ft) and a prominence of 2,995 metres (9,826 ft). Its name means "White Peak of the Three Spiritual Brothers".
It lies on the border with Tibet (however, see below for disputes about its exact location). After Bhutan was opened for mountaineering in 1983 there were four expeditions that resulted in failed summit attempts in 1985 and 1986. In 1999, a Japanese expedition successfully climbed Liankang Kangri, a 7,535 metres (24,721 ft) subsidiary peak (not an independent mountain), separated from the main peak by a 2 kilometres (1.2 mi) long ridge to the north-northwest. Since 1994, climbing of mountains in Bhutan higher than 6,000 metres has been prohibited out of respect for local spiritual beliefs, and since 2003 mountaineering has been forbidden completely. Gangkhar Puensum may keep its unique status for some time: any higher unclimbed peaks in the world are likely to be subsidiary tops, not separate mountains.
Ball's Pyramid is an erosional remnant of a shield volcano and caldera lying 20 kilometres (12 mi) southeast of Lord Howe Island in the Pacific Ocean. It is 562 metres (1,844 ft) high, while measuring only 1,100 metres (3,609 ft) in length and 300 metres (984 ft) across, making it the tallest volcanic stack in the world. Ball's Pyramid is part of the Lord Howe Island Marine Park in Australia and is over 643 kilometres (400 mi) northeast of Sydney, New South Wales.
Steep, eroded, and formed 6.4 million years ago, Ball's Pyramid is positioned in the centre of a submarine shelf and is surrounded by rough seas, making any approach difficult. Shiprock (Navajo: Tsé Bit?a?í, "rock with wings" or "winged rock") is a monadnock rising nearly 1,583 feet (482.5 m) above the high-desert plain of the Navajo Nation in San Juan County, New Mexico, United States. Its peak elevation is 7,177 feet (2,187.5 m) above sea level. It is about 10.75 miles (17.30 km) southwest of the town of Shiprock, which is named for the peak.

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