You need one more digit.
+290 = Saint Helena and Tristan da Cunha (UK territories in the Atlantic)
+291 = Eritrea (East Africa)
+297 = Aruba (Caribbean)
+298 = Faroe Islands (Danish islands between Scotland and Iceland)
+299 = Greenland
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Fiji has telephone country code +679.
Country code +57 is Colombia.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.
Niue is country code +683.
Togo is country code +228.
Liberia is country code +231.