Subgroup U5 is restricted to Finland and it's populations.

Haplogroup U is a group of people who descend from a woman who lived around 50,000 years ago in the Haplogroup R branch of the Genographic tree. Her descendants gave birth to several subgroups, some of which exhibit specific geographic homelands. For example a subgroup U5 is restricted to Finland and it's populations. This is likely the result of geographical, linguistic and cultural isolation of the Finnish populations that has kept it fairly isolated genetically. Haplogroup U5 that first evolved in Europe is a group of people who descend from a woman who lived around 15,000 years ago. U5 is found also in small frequencies and at much lower diversity in The Near East suggesting back-migration of people from northern Europe to south.