Read this: Very few historical records exist of the period before the medieval Licchavis rulers. According to Gopalraj Vansawali, a genealogy of Nepali monarchs, the rulers of Kathmandu Valley before the Licchavis were Gopalas, Mahispalas, Aabhirs, Kirants, and Somavanshi. The Kirata dynasty was established by Yalamber. During the Kirata era, a settlement called Yambu existed in the northern half of old Kathmandu. In some of the Sino-Tibetan languages, Kathmandu is still called Yambu. Another smaller settlement called Yengal was present in the southern half of old Kathmandu, near Manjupattan. During the reign of the seventh Kirata ruler, Jitedasti, Buddhist monks entered Kathmandu valley and established a forest monastery at Sankhu.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What geographical part of Kathmandu did Yambu once occupy?
northern