Ronald Edwin Naar was a Dutch

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 mountaineer

Mountaineer

-Sports:*Mountaineering, the sport, hobby or profession of walking, hiking, trekking and climbing up mountains, also known as alpinism-University athletic teams and mascots:*Appalachian State Mountaineers, the athletic teams of Appalachian State University...

 known as Netherlands

Netherlands

The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 most famous adventurer.

Naar was born in The Hague

The Hague

The Hague is the capital city of the province of South Holland in the Netherlands. With a population of 500,000 inhabitants , it is the third largest city of the Netherlands, after Amsterdam and Rotterdam...

, and was an active climber from the 1970s onwards. He made the first ascents of Peak 6393 in the Karakorum

Karakorum

Karakorum was the capital of the Mongol Empire in the 13th century, and of the Northern Yuan in the 14-15th century. Its ruins lie in the northwestern corner of the Övörkhangai Province of Mongolia, near today's town of Kharkhorin, and adjacent to the Erdene Zuu monastery...

, Djo Drake in Bhutan

Bhutan

Bhutan , officially the Kingdom of Bhutan, is a landlocked state in South Asia, located at the eastern end of the Himalayas and bordered to the south, east and west by the Republic of India and to the north by the People's Republic of China...

, Tilleketinda on Greenland

Greenland

Greenland is an autonomous country within the Kingdom of Denmark, located between the Arctic and Atlantic Oceans, east of the Canadian Arctic Archipelago. Though physiographically a part of the continent of North America, Greenland has been politically and culturally associated with Europe for...

 and Duivelsei in Surinam. He made the first Dutch ascents of several mountains, including the Eiger

Eiger

The Eiger is a mountain in the Bernese Alps in Switzerland. It is the easternmost peak of a ridge crest that extends across the Mönch to the Jungfrau at 4,158 m...

 (north face), Nanga Parbat

Nanga Parbat

Nanga Parbat is the ninth highest mountain on Earth, the second highest mountain in Pakistan and among the eight-thousanders with a summit elevation of 8,126 meters...

 and K2

K2

K2 is the second-highest mountain on Earth, after Mount Everest...

, and was the first Dutch climber to complete the Seven Summits

Seven Summits

The Seven Summits are the highest mountains of each of the seven continents. Summiting all of them is regarded as a mountaineering challenge, first postulated as such and achieved on April 30, 1985 by Richard Bass .-Definition:...

.

He wrote several books about climbing.

Naar died while climbing on Cho Oyu

Cho Oyu

Cho Oyu is the sixth highest mountain in the world at above sea level. Cho Oyu lies in the Himalayas and is 20 km west of Mount Everest, at the border between China and Nepal...

 in Tibet

Tibet

Tibet is a plateau region in Asia, north-east of the Himalayas. It is the traditional homeland of the Tibetan people as well as some other ethnic groups such as Monpas, Qiang, and Lhobas, and is now also inhabited by considerable numbers of Han and Hui people...

at an altitude of around 8000 metres (26,200 feet) after becoming unwell.