translation.en: There are still very unknown mountains, like Marahuaca, which is almost 3,000 meters high above sea level, or Aracà, which is in the upper region of Rio Negro in Brazil.
translation.zh: 还有很多未被探索过的山脉， 比如马拉瓦卡山，海拔将近3000米， 还有阿拉卡山，位于巴西内格罗河上游。