CU — Cuba

Cuba is the largest island in the Caribbean, located at the mouth of the Gulf of Mexico. Havana, the capital, is famous for its colonial architecture and vintage cars. Cuba unified its dual currency system in 2021, eliminating the convertible peso (CUC) and keeping only the Cuban Peso (CUP). For developers, the CU country code maps to the es-CU locale for Cuban Spanish. The .cu domain has limited international visibility due to US sanctions and restricted internet access within Cuba. The +53 dialing code serves Cuban telecommunications. Cuba's embargo and sanctions create significant complications for developers — US-based services often geoblock Cuban IP addresses, payment processing is restricted, and app store availability may be limited. The 2021 currency unification from dual currencies to a single CUP simplified but requires handling historical CUC data. Cuba's restricted internet and unique regulatory environment make it an important edge case for compliance-aware application development.