When he came to the edge of water he saw something black in colour struggling to come out, it was Kari’s trunk.

The first thing the writer saw in the water was the trunk of his elephant.

When the writer looked into the water, he saw the reflection of his elephant. The elephant had come to the river to bathe and was standing in the water. As the writer gazed into the river, he saw the image of the elephant's trunk, which was long and curved. This was the first thing that caught his attention.

Explanation:
- The writer was near a river and decided to look into the water.
- As he looked, he noticed something unusual and interesting.
- The writer saw the reflection of his elephant in the water. The elephant had come to the river to bathe.
- The writer observed the elephant's trunk, which was long and curved, and this became the first thing he noticed.

Importance of the trunk:
- The trunk is a distinctive feature of an elephant and plays a crucial role in its survival.
- It is a long, muscular, and flexible organ that is used for various purposes.
- Elephants use their trunks for breathing, smelling, drinking, and grabbing objects.
- The trunk is also used for communication, as elephants can make different sounds by blowing air through it.
- Additionally, elephants use their trunks to shower themselves with water and to spray mud on their bodies as a way of cooling down and protecting their skin from insects.

Conclusion:
In conclusion, the writer saw the trunk of his elephant in the water when he looked into the river. The trunk is a remarkable feature of an elephant and serves multiple functions in their daily activities.