# getSc2RealmsByRegionId
Returns a flat array of StarCraft II realms associated with region ID provided as a parameter.
It throws RangeError
when provided region ID is non-existent or invalid.
const { BlizzAPI } = require('blizzapi');
console.log(BlizzAPI.getSc2RealmsByRegionId(1));
// [
// 1,
// 2
// ]
console.log(BlizzAPI.getSc2RealmsByRegionId(44));
// RangeError: 44 is not a valid parameter for getConstantByRegionId(44, 'SC2_REALMS')