The geography of events in all Hindu scriptures are confined only to the Indian sub-continent. If you look at the the various places where events of Hindu scriptures took place you get:
- Northern most - the Himalayas eg. Hanuman brought sanjeevani leaves from the Himalayas
- Southern most - Lanka
- Eastern most - Pragjotishpur which is the ancient name of Assam is mentioned several times. There is a holy placed called Vasistha near Guwahati which is believed to the ashram of Ram's guru Vasistha
- Westernmost - Saraswati which is believed to be flow in modern day Pakistan to Allahabad where it met with the Gangan and Yamuna. Saraswati is mentioned six times in Valmiki Ramayana.
Beyond these four extreme locations, events of the Ramayana do not take place.
Events of the Mahabharata have take place in a much wider geographical area
- Northernmost - Himalayas e.g. where Pandavs go on their journey to
- Southern most - Lanka e.g. stories of Ram and Ravana were known in the Mahabharata era
- Eastern most - Manipur where Arjun's family Chitrangada and Babrubahana ruled. Pragjotishpur (Assam) is also mentioned e.g. Krishna and Satyabhama defeated Narakasur in Pragjotishpur. Ghatotkacha's mother Maurvi was the daughter of the senapati of Pragjyotishpur.
- Western most - Kaal Yavan the king of Yaman, king who attacked Mathura was from Yavan desh (Yaman) which was considered to be a kingdom from the west along with Gandhar. Ghandar is believed to be the modern day Kandahar in Afganistan where Shakunis father Subal ruled.
Outisde these 4 extreme boundaries in the North, South, East and West, there is no known reference to the involvement of the people any other lands or anything in those lands including pyramids of Egypt or America. It is natural to undestand that Mahabharata has a wider grography because it was written after the Ramayana.
It is also interesting to note from geographical point of view the rivers that were prominient during various yugs.
- During the Satya yug/Vedic ages, Saraswati was the most popular religious river and is mentioned much more than Ganga in the Rig Veda.
- In the Ramayana ages, Ram's ancestor Bhaghirath brought Ganga to earth to purify the souls of his ancestors. But the river Sarayu was already there on earth and so Sarayu it was much more popular in the Ramayana than the Ganga and several events of the Ramayana are connected to the river Sarayu
- In the Mahabharata, Ganga is clearly the most popular river
Source: All these information is not present collectively in one single scripture so the best reference would be the Rig Veda, Ramayana and the Mahabharata directly.