How to make 200×300 size flat land in my world with command

The command to make flat land in my world is: /locate temple.

Commands are usually used on servers and in online mode, where you can enter the command code to change aspects of the game, such as the time of day, the weather, and so on. Commands can be used to summon command cubes to do interesting things, and are mostly used for map making, provided you have cheat mode enabled.

Gameplay

Introduction

Players are free to choose from a variety of game modes [Survival, Creation, Adventure, Extreme (Java only) and Spectator (Java only)]. In each mode, players can experience different and interesting ways of playing, enjoying the fun of fighting monsters and adventures in Survival Mode, and enjoying the fun of being a creator in Creation Mode. The game is based on the theme of players freely creating and destroying different kinds of cubes in three-dimensional space.

Players can complete the game's achievements (progress) by destroying or creating elaborate buildings and art in single-player or multiplayer modes, or by collecting items to explore the map. Players can also experiment with gameplay such as redstone circuits and commands.