Kungur is one of the oldest maps of TankiOnline. It's been availaible since the Open Beta, and was one of the most popular maps ever. It was the most played map for about half a year. It's a big map, which is good for all types of weapons. The max number of players number it's 20, ten in each team. It also allows the three Game Modes.
Any type of tank/weapon is good to play in Kungur. Since it's a big map, however, long range weapons are slightly better.