Creates a cuboid that is includes all locations of a locations list.

Convert location list to cuboid

//to get main cuboid class: https://www.spigotmc.org/threads/region-cuboid.329859/

public static Cuboid convertCuboid(final List<Location> locations) {
		int firstPosX = Integer.MIN_VALUE;
		int firstPosY = Integer.MIN_VALUE;
		int firstPosZ = Integer.MIN_VALUE;

		int secondPosX = Integer.MAX_VALUE;
		int secondPosY = Integer.MAX_VALUE;
		int secondPosZ = Integer.MAX_VALUE;

		World world = null;

		for (final Location loc : locations) {

			if (loc == null || loc.getWorld() == null) continue;
			if (world == null) world = loc.getWorld();
			if (world != loc.getWorld())
				throw new IllegalStateException("world of location can not be different! (expected: " + world.getName() + ", but found: " + loc.getWorld().getName() + "");

			final int x = loc.getBlockX();
			final int z = loc.getBlockZ();
			final int y = loc.getBlockY();

			if (firstPosX < x) firstPosX = x;
			if (firstPosY < y) firstPosY = y;
			if (firstPosZ < z) firstPosZ = z;

			if (secondPosX > x) secondPosX = x;
			if (secondPosY > y) secondPosY = y;
			if (secondPosZ > z) secondPosZ = z;
		}

		if (world == null) return null;

		return new Cuboid(new Location(world, firstPosX, firstPosY, firstPosZ), new Location(world, secondPosX, secondPosY, secondPosZ));
	}

Red: locations which is you'll give
Light Blue: cuboid which is method'll give
Dark Blue: space