llanero

Japanese: llanero

...the cowboys of the Pampas, which straddle Argentina and Uruguay. They are called llanero in Venezuela and eastern Colombia, gaucho in Brazil, and huaso in Chile. Cattle and horses were introduced to the Pampas by the Spanish in the mid-16th century, and cattle in particular were well adapted to the ecological conditions of the Pampas, becoming wild and their numbers increasing rapidly.

From Llano

...The majority of the population is Indian. Herdsmen, called llaneros, once served as excellent soldiers for Simón Bolívar, the father of South American liberation, and played an important role in the liberation of Venezuela. After World War II, large-scale irrigation projects and dam construction were carried out along the Orinoco and Apure rivers in Venezuela, and land was reclaimed for farming.

*Some of the terminology that mentions "llanero" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…アルゼンチンとウルグアイにまたがるパンパの牧童(カウボーイ)。ベネズエラやコロンビア東部ではリャネロllanero，ブラジルではガウショgaucho，チリではワッソhuasoという。パンパには16世紀半ばにスペイン人により牛馬が移入され，なかでも牛はパンパの生態条件によく適合し，野生化してその数が急増した。…