Saint Kitts and Nevis Flag Documentation. The national flag of Saint Kitts and Nevis was officially adopted on September 19, 1983, the day the nation gained independence from the United Kingdom. The flag represents the country's rich history, culture, and aspirations for unity and progress. The flag consists of a diagonal black stripe with a yellow border, running from the lower hoist-side corner to the upper fly-side corner. This documentation provides information on flag specifications, usage regulations, proportions, and historical significance as per the Constitution of Saint Kitts and Nevis and international flag protocols.