Parallel drainage pattern. A parallel drainage system is a pattern of rivers caused by steep slopes with some relief. Because of the steep slopes, the streams are swift and straight, with very few tributaries, and all flow in the same direction.
1 In Creative, the player can use spawn eggs to spawn most mobs. 2  When mobs are spawned this way, all normal spawning requirements, such as light level and block type, are ignored. 3  Any entity can be spawned using the /summon command.
From minecraft commands to building. Type in: </seed> (without the arrows). Look up, slime chunk finder. Copy your seed into the webpage. It will show you what chunks can spawn slimes. Click f-3 to see your cordinates and chunk on the left side. They can only spawn under level 40 and they may take a while to spawn if there are other hostile mobs in the area.