Sansara is the name given to the original “mainland” (“continent”) land mass in Second Life. Some background is on the Second Life Wiki which includes a map naming various regions and showing their geography.
Sansara in 2015
This is how Sansara looks today. The white region in the South-West is the original Snowlands zone in Second Life.
Sansara and the Full Second Life Map
Each small block on this map of the Second Life available at http://maps.secondlife.com is a 256m X 256m region. The Sansara continent is the large land mass with the white snow zone.
Sansara Regions and Geography
The Second Life Wiki which includes a Sansara map naming various regions and showing their geography.
Maps of Second Life
A collection of historical Maps of Second Life is available at the New Kadath Lighthouse Art Gallery, New Kadath (34, 51, 22) – http://maps.secondlife.com/secondlife/New%20Kadath/34/52/23