The following are the lists of rivers, mountains, and plains in Nepal:
Rivers: There are approximately 6000 rivers and rivulets in Nepa. The following are a few major rivers out of those 6000 -
Kankai River, Yubraj river, Koshi River, Tamor, Arun, Sunkoshi, Dudh Koshi, Imja Khola, Hongu River, Liku River or Likhu Khola, Bhote Koshi, Tama Koshi, Indravati River, Bagmati River
Mountains: Owing to the presence of Himalayas, there are hundreds of mountains in Nepal. The following are a few of those -
Mount Everest, Kanchenjunga, Lhotse, Makalu, Cho Oyu, Dhaulagiri I, Manaslu, Annapurna I, Gyachung Kang, Annapurna II, Himalchuli, Ngadi Chuli, Nuptse, etc.
Plains: There are only four plains in Nepal which are namely -
Bhuikhel, Indo-Gangetic Plain, Inner Terai Valleys and Plains of Nepal, and Terai.