As the description on Amazon is really very short, here is the complete version, as it is described by GARMIN on their website:
This product provides detailed road maps and points of interest for compatible devices, so you can navigate using of exact turn to any address or intersection. Route to restaurants, gas stations, lodging, attractions and more.
With more than 4.9 million points of interest and more than 10.2 million kilometers of road coverage throughout the continent City Navigator Europe NT delivers all the data you need for navigation in Europe. City Navigator provides the most detailed on the market road maps with exact turn to any address or intersection. You can use it to enter restaurants, gas stations, lodging, attractions and more than target. Powered by NAVTEQ, a world leader in premium-quality digital map data.
City Navigator Europe NT 2012 now includes coverage for Romania and Ukraine. Full country coverage for Western Europe and many countries in Eastern Europe. Improved detailed coverage for Romania and Ukraine. Coverage for French Guiana and the islands of Malta, St. Barthélemy, Martinique, Guadeloupe and Réunion.
More than 10 million km (6.2 million miles) of road coverage, including motorways, national and regional thoroughfares and local roads in Western Europe and many cities in Eastern Europe. More than 4.5 million points of interest of the country, eg. Restaurants, lodging, border crossings, attractions, petrol stations, campsites, shopping and more.
Navigation features like turn restrictions, roundabout guidance, speed categories and more.
Country coverage City Navigator Europe NT 2012:
Great Britain: Full coverage
Scotland: Full Coverage
Wales: Full coverage
Isle of Man: Full coverage
Northern Ireland: Full coverage
Ireland: Full coverage
Channel Islands: Full coverage
Denmark: Full coverage
Finland: Full coverage
Iceland: Full coverage
Norway: Full coverage
Sweden: Full coverage
Andorra: Full coverage
Belgium: Full coverage
France: Full coverage
French Guiana: Coverage for most urban areas
Guadeloupe: coverage for the majority of urban areas
Martinique: Coverage for most urban areas
Netherlands: Full coverage
Luxembourg: Full coverage
Reunion: Coverage for most urban areas
Saint-Barthelemy: Full Coverage
Italy: Full coverage
Austria: Full coverage
Switzerland: Full coverage
Liechtenstein: Full coverage
Malta: Full coverage
Spain: Full coverage
Portugal: Full coverage
Gibraltar: Full coverage
Azores: Full coverage
Canary Islands: Full coverage
Balearic Islands: Full coverage
Madeira: Full coverage
Germany: Full coverage
Czech Republic: Full coverage
Greece: Full coverage
Estonia: Full coverage
Latvia: Full coverage
Lithuania: Full coverage
Poland: Full coverage
Slovakia: Full coverage
Hungary: Full coverage
Slovenia: Full coverage
Croatia: Full coverage
Bulgaria: Full coverage
Romania: coverage for the majority of urban areas
Turkey: Full coverage
Moldova: Major roads only
Bosnia and Herzegovina: Major roads only
Serbia and Kosovo: Complete coverage
Montenegro: Coverage for most urban areas
Albania: Major roads only
Republic of Macedonia (FYROM): Coverage for most urban areas
Belarus: Major roads only
Ukraine: Coverage for most urban areas
