Listagem de países com reus respectivos locales, roubado direto do java.utils.Locale.

gistfile1.yml

countries:
  - ["ar_AE", "United Arab Emirates"]
  - ["ar_BH", "Bahrain"]
  - ["ar_DZ", "Algeria"]
  - ["ar_EG", "Egypt"]
  - ["ar_IQ", "Iraq"]
  - ["ar_JO", "Jordan"]
  - ["ar_KW", "Kuwait"]
  - ["ar_LB", "Lebanon"]
  - ["ar_LY", "Libya"]
  - ["ar_MA", "Morocco"]
  - ["ar_OM", "Oman"]
  - ["ar_QA", "Qatar"]
  - ["ar_SA", "Saudi Arabia"]
  - ["ar_SD", "Sudan"]
  - ["ar_SY", "Syria"]
  - ["ar_TN", "Tunisia"]
  - ["ar_YE", "Yemen"]
  - ["be_BY", "Belarus"]
  - ["bg_BG", "Bulgaria"]
  - ["ca_ES", "Spain"]
  - ["cs_CZ", "Czech Republic"]
  - ["da_DK", "Denmark"]
  - ["de_AT", "Austria"]
  - ["de_CH", "Switzerland"]
  - ["de_DE", "Germany"]
  - ["de_LU", "Luxembourg"]
  - ["el_CY", "Cyprus"]
  - ["el_GR", "Greece"]
  - ["en_AU", "Australia"]
  - ["en_CA", "Canada"]
  - ["en_GB", "United Kingdom"]
  - ["en_IE", "Ireland"]
  - ["en_IN", "India"]
  - ["en_MT", "Malta"]
  - ["en_NZ", "New Zealand"]
  - ["en_PH", "Philippines"]
  - ["en_SG", "Singapore"]
  - ["en_US", "United States"]
  - ["en_ZA", "South Africa"]
  - ["es_AR", "Argentina"]
  - ["es_BO", "Bolivia"]
  - ["es_CL", "Chile"]
  - ["es_CO", "Colombia"]
  - ["es_CR", "Costa Rica"]
  - ["es_DO", "Dominican Republic"]
  - ["es_EC", "Ecuador"]
  - ["es_ES", "Spain"]
  - ["es_GT", "Guatemala"]
  - ["es_HN", "Honduras"]
  - ["es_MX", "Mexico"]
  - ["es_NI", "Nicaragua"]
  - ["es_PA", "Panama"]
  - ["es_PE", "Peru"]
  - ["es_PR", "Puerto Rico"]
  - ["es_PY", "Paraguay"]
  - ["es_SV", "El Salvador"]
  - ["es_US", "United States"]
  - ["es_UY", "Uruguay"]
  - ["es_VE", "Venezuela"]
  - ["et_EE", "Estonia"]
  - ["fi_FI", "Finland"]
  - ["fr_BE", "Belgium"]
  - ["fr_CA", "Canada"]
  - ["fr_CH", "Switzerland"]
  - ["fr_FR", "France"]
  - ["fr_LU", "Luxembourg"]
  - ["ga_IE", "Ireland"]
  - ["hi_IN", "India"]
  - ["hr_HR", "Croatia"]
  - ["hu_HU", "Hungary"]
  - ["in_ID", "Indonesia"]
  - ["is_IS", "Iceland"]
  - ["it_CH", "Switzerland"]
  - ["it_IT", "Italy"]
  - ["iw_IL", "Israel"]
  - ["ja_JP", "Japan"]
  - ["ja_JP_JP", "Japan"]
  - ["ko_KR", "South Korea"]
  - ["lt_LT", "Lithuania"]
  - ["lv_LV", "Latvia"]
  - ["mk_MK", "Macedonia"]
  - ["ms_MY", "Malaysia"]
  - ["mt_MT", "Malta"]
  - ["nl_BE", "Belgium"]
  - ["nl_NL", "Netherlands"]
  - ["no_NO", "Norway"]
  - ["no_NO_NY", "Norway"]
  - ["pl_PL", "Poland"]
  - ["pt_BR", "Brazil"]
  - ["pt_PT", "Portugal"]
  - ["ro_RO", "Romania"]
  - ["ru_RU", "Russia"]
  - ["sk_SK", "Slovakia"]
  - ["sl_SI", "Slovenia"]
  - ["sq_AL", "Albania"]
  - ["sr_BA", "Bosnia and Herzegovina"]
  - ["sr_CS", "Serbia and Montenegro"]
  - ["sr_ME", "Montenegro"]
  - ["sr_RS", "Serbia"]
  - ["sv_SE", "Sweden"]
  - ["th_TH", "Thailand"]
  - ["th_TH_TH", "Thailand"]
  - ["tr_TR", "Turkey"]
  - ["uk_UA", "Ukraine"]
  - ["vi_VN", "Vietnam"]
  - ["zh_CN", "China"]
  - ["zh_HK", "Hong Kong"]
  - ["zh_SG", "Singapore"]
  - ["zh_TW", "Taiwan"]

LocaleStealer.java

import java.util.Locale;

class LocaleStealer {
    public static void  main(String[] args) {
        Locale[] availableLocales = Locale.getAvailableLocales();

        System.out.println("countries:")
        for (Locale locale : availableLocales) {
            if(! locale.getDisplayCountry().equals("")) {
                System.out.println(String.format("  - [\"%s\", \"%s\"]", locale, locale.getDisplayCountry()));
            }
        }
    }
}