code: public List<Integer> getAllContinentRegionID(int continentID, int floorID) throws GuildWars2Exception {
  		try {
  			Response<List<Integer>> response = gw2API.getAllContinentRegionIDs(Integer.toString(continentID),
  					Integer.toString(floorID)).execute();
  			if (!response.isSuccessful()) throwError(response.code(), response.errorBody());
  			return response.body();
  		} catch (IOException e) {
  			throw new GuildWars2Exception(ErrorCode.Network, "Network Error: " + e.getMessage());
  		}
  	}
docs: For more info on continents API go <a href="https://wiki.guildwars2.com/wiki/API:2/continents">here</a><br/>
  Get all continent region ids
  
  @param continentID {@link Continent#id}
  @param floorID     {@link ContinentFloor#id}
  @return list of continent region ids
  @throws GuildWars2Exception see {@link ErrorCode} for detail
  @see ContinentRegion continent region info