What is the arena and how is it divided?

The arena is where the Little Big Snake’s crazy game experience takes place.

How is the game’s arena divided? What does it comprise of?

Fields/Land: Arena’s Land consists of Fields. Here you’ll find slugs, other snakes, nectar, Green & Brown Eggs, and Bugs to eat and grow your Snake’s Mass. It is nothing but any portion of the Arena only.
River: To fasten the speed of your snake, swim in the river. This is the reason why most of the battles between the leading snakes happen near the water. It is like the Boundry of the Mainland. You can see the path in blue, in the mini-map once you are in the Game. Slugs die inside water. Eggs float, and Bugs can walk on water.

Mountains / Rocks: There are two types of mountains in Little Big Snake, which the Fandom Page of Little Big Snake has named as, Lair Mountain and Mountains. The simple rock structures can appear (seemingly) randomly anywhere on the land. You hit it and you are rewarded with the title of “Kamikaze.” Bugs die as well if they hit the rock. But there’s one more type of rock, which takes you back to your Dashboard, and a dialogue box appears saying, “You have returned to the Lair alive and unharmed,” and you get 50% bonus to the earned score. There are two of them, visible on the left and right edges of the mini-map as a gate or tomb-like symbols.

Bushes (Hijira Bushes as named by LBS Fandom): The bushes are red spikes, and they are said as “end of the world,” by Fandom community of LBS. They act as a border for the whole arena. These red bushes kill snakes, slugs, and bugs, but instead of dropping behind whatever mass (or nectar), crowns, and slugs, you have collected in the game, your snake vanishes, leaving behind nothing to be consumed by other players.