Answer:
AKA Nepal Valley or Nepa Valley. It lies at the crossroads of the Indian subcontinent and the broader Asian continent. It also lies where the ancient civilizations of these regions were.
Has about 130 important monuments/establishments, like several pilgrimage sites for Hindus and Buddhists. There are also seven World Heritage Sites within the valley.
The Kathmandu Valley has said to have been the most developed and populated place in Nepal.
Historically, the valley and nearby areas, made up a confederation known as the Nepal Mandala.