1. Geography - Map of Ramayan

Image below is an attempt to reconstruct the Map of India during the Ramayan Period based on the description of Valmiki Ramayan (http://www.valmikiramayan.net/)

List of Kings Invited for Dasaharatha's Ashwamedha Yagna. ( Book1:Bala Kanda: Chapter 13, Verse 19 onwards)
1. King of Kaashi
2. Janaka - King of Mithila/Videha
3. King of Kekaya (Dasharatha's In-Laws)
4. Bhanumanta - King of Kosala
5. Praaptijna - King of Magadha
6. Kings of Sindhu, Sauviira and Sauraastra Kingdoms
7. Kings of Southern Kingdoms
* For the same event - best horses born in countries like Kaambhoja, Baahlika, Vanaayu (Foreign Kingdoms) were brought.