The oceans, rivers, lakes, and trees are very important to us and our environment as they provide us with fresh and clean water and food. Rivers flow from several origins. These origins can be lakes and mountains. Almost every river meets another river or ocean at the end of its journey. The river which meets the main river is called the tributary. The area through which a river passes is called its catchment area. To maintain the level of the river and its flowing speed, it is necessary to make sure that we don't exploit the catchment area.

It is often said that our world resides in a small seed. In the same way, a small seed has a whole tree inside it. These trees and plants are our first mothers. Their leaves, flowers, roots, fruits, and seeds are a part of our daily diet and provide us with nutrition. Without these trees, our world is incomplete. They provide us not only with food but also with oxygen. They absorb carbon dioxide and release oxygen.

In this book, detailed information has been given about our oceans, rivers, and lakes, and a brief description of life-giving trees has been given. After reading this book and understanding the role these natural resources play in our lives, we may understand their importance. In Mahatma Buddha's words, "The trees are magical beings in this world. They provide shade to all, even to those who come with axes to cut them down."