Where will Kalki avatar take birth and why?

The current Kali yuga (period) is said to end on a bad note when evil will take over the good.

It is believed that the Lord Kalki avatar will appear to slay the wicked and usher in a new era. 

He will be seated on a white horse, with a naked sword flashing like a comet. 

Lord Kalki will reportedly be born as a son at the residence of an austere Brahmin named Vishnu Yasha in Shambhala, Moradabad, Uttar Pradesh.

Lord Kalki will eliminate the world of sinners by riding on a horse or chariot named Devadatta and reestablishing religion.

He will take birth on the thirteenth day during the fortnight of the waxing moon.