rivers.clone().
addElement(VanillaBiomes.BEACH, -1, 0.16f).
addElement(VanillaBiomes.RIVER, 0.16f, 1);
// land
final BiomeSelectorLayer land =
new WhittakerLayer(7).
setHumidityOctaveCount(1).
setHumidityFrequency(0.0005 / scale).
setTemperatureOctaveCount(1).
setTemperatureFrequency(0.0005 / scale).
addElement(desert, 20, 50).