Question For The Day 13 Sept 06

Which Place / State / Area is related to all of these ??











Hints
1. Silica.
2. Guta Dynasty / King Harsa


Answer for the Day 13 Sept 06
Well Looks like it was more complex than what I thought !!
Answer I was looking for is United Province of Agra and Oudh. This is roughly modern day Uttar Pradesh.
How ::
Mahabharata . ( Hastinapur and Kurukshetra )
Ramayana ( Ayodhya )
Buddhism ( Kushinagar )
Silica ( UP is the India's largest Silica producing State. )
Those Kings has ruled UP time to time.
To those who answered Bihar. I am not able to relate Silica , Mahabharata and Ramayana to bihar hence not accepting it as correct answer.