The arena of the 74th Hunger Games.
The 74th Hunger Games arena contained forests, streams, meadows, a wheat field, caves, and a lake. The majority of the tributes made good use of it, such as Peeta and his camouflage, Thresh in the wheat field, Katniss and Rue with the trees, Foxface wherever she could hide, and the Career Tributes with the lake. This arena was fairly dull compared to other arenas used throughout the Hunger Games, but was truly enormous, and it would take a tribute several days to walk from one end of the arena to the other. Somewhere deep in the forest was a cave where Katniss and Peeta stayed when Peeta was severely injured.
The Cornucopia
The tributes were launched around the Cornucopia on pedestals, which was on a plain in the center of the arena. The mines under the tribute plates, which are deactivated after the minute of standing for the tributes, were activated later by the male tribute from District 3. When Foxface was going to steal food from the careers supply, she was jumping in cetain spots seen by Katniss. Katniss didn't know why until later, when she figured out it was mined and then blew up the food supply.
Muttations
Some of the muttations residing in the arena were tracker jackers - which helped Katniss take out some Careers, and wolf-like muttations - which weren't seen until only Cato, Katniss, and Peeta were the only tributes left. There were also many mockingjay nests residing high in the trees.
Food and water sources
There were also many normal animals in the arena, which tributes could use as food sources. If they knew how to make traps, or had a weapon they could hunt with, for example rabbits and squirrels, fish, grooslings, and waterfowl. Thresh used the wheat field as a source of food. There were also quite a lot of bushes with berries around the arena. Some of them were edible, but there were also some bushes with nightlock berries, which killed Foxface. There were also a lot of streams in the arena. However, most of them were not clean, and Katniss needed to use iodine before drinking.
After the 74th Annual Hunger Games
After the end of the war, the arena was destroyed and memorials to the fallen tributes were constructed in its place.