Boomi Sasthram is a Tamil book published in 1832 by Kanam Irenius Iyer. It was one of the first books on geography in Tamil. Sanskrit terms are extensively used in this book.

The geography, countries, climate, people and species of every continent inhabited by the people of the earth are written in this book in Tamil that children can understand. A number of terms were adopted which later came into wider use.

Boomi Sasthram was published by Nellai Apostle Rev. C. T. E. Rhenius Iyer in 1832 from Palayankottai with the intention that Tamils ¿¿should know about all the universes including the earth.

It has been written to know the real God Paraparan and to teach and teach other teachings that convey wisdom and to study and to remove ignorance and to know what is in the world through this Boomi Sasthram

It is noteworthy that this Boomi Sasthram was the first book published in Tamil.

It is the greatest treasure we have got our hands on. The Tirunelveli Christian History Society has taken this initiative in the language style of this period with the aim that the people of the church of this period should also know.