On Tuesday, President Obama will deliver the annual State of the Union address to a joint session of the U.S. Congress. Following a year that has a seen a number of distressing international issues, Obama may well use his speech to talk about foreign policy.

If he does so, he will be following a rich tradition. It was in the 2002 State of the Union address that President George W. Bush identified North Korea, Iran and Iraq as an "Axis of Evil," and President James Monroe first outlined what would become the Monroe Doctrine in 1823. In fact, most countries have been referenced in a State of the Union address at some point or another, some far more than others: The past nine presidents have all mentioned China, Japan, Korea (either North or South or just Korea) and the Soviet Union or Russia at least once in their State of the Union addresses.

But what about the countries that have not been mentioned? The Washington Post has looked through all of the State of the Union speeches since 1964 to see which ones are conspicuous by their absence. In total, almost 70 nations have not been directly mentioned in the past half-century of State of the Union addresses.

Some of the countries omitted are understandable – there was probably little reason for a president to mention the Solomon Islands – but others may come as a surprise. European nations such as Ireland and Belgium have never been mentioned. The United Arab Emirates hasn't been mentioned, nor has Malaysia. Bangladesh, one of the most populous countries in the world, has not been directly referenced in the past 50 years.

In some cases, there's a technicality: Countries such as Latvia and Estonia were referred to as the "Baltics," while countries like Montenegro, Slovenia and Montenegro were once known as "Yugoslavia."

But it's not hard to notice certain regions have been omitted more than others: Notice the big purple blots over Central Asia and Western and Central Africa in the map above? The State of the Union is a major opportunity for U.S. leaders to explain how they see the world – but apparently some parts of the world are more visible than others.

To see what countries were mentioned, click here. The full list of those not mentioned is below.

Country Continent
Albania Europe
Armenia Asia
Austria Europe
Azerbaijan Asia
Bangladesh Asia
Belgium Europe
Belize North America
Benin Africa
Bhutan Asia
Brunei Asia
Burkina Faso Africa
Burundi Africa
Cameroon Africa
Central African Republic Africa
Croatia Europe
Democratic Republic of the Congo Africa
Djibouti Africa
Equatorial Guinea Africa
Eritrea Africa
Estonia Europe
Fiji Oceania
Finland Europe
Gabon Africa
Gambia Africa
Guatemala North America
Guinea Bissau Africa
Guyana South America
Ireland Europe
Ivory Coast Africa
Kazakhstan Asia
Kyrgyzstan Asia
Latvia Europe
Lesotho Africa
Lithuania Europe
Luxembourg Europe
Macedonia Europe
Madagascar Africa
Malawi Africa
Malaysia Asia
Mauritania Africa
Moldova Europe
Mongolia Asia
Montenegro Europe
Nepal Asia
Niger Africa
Oman Asia
Papua New Guinea Oceania
Republic of Congo Africa
Senegal Africa
Sierra Leone Africa
Slovakia Europe
Slovenia Europe
Solomon Islands Oceania
Sri Lanka Asia
Suriname South America
Swaziland Africa
Sweden Europe
Switzerland Europe
Tajikistan Asia
The Bahamas North America
Togo Africa
Turkmenistan Asia
Uganda Africa
United Arab Emirates Asia
Uzbekistan Asia
Vanuatu Oceania