Countries do not have to exist today to be an answer. They must only have bordered France or its possessions at one point since 1870. Vichy France, the 3rd, 4th, and 5th Republics count as France.
Militarily occupied territory does not count. Only lands that were annexed. Modern (1986) "regions" are used for the third column.
Afrique occidentale française (1870-1958); L'Inde française (1870-1954); Côte française des Somalis (1884-1960); Union Indochinoise (1893-1942; 1945-1948); Tchad (1900-1958); Cameroun (1918-1958); Syrie (1920-1946)
1870-1958
Afrique occidentale française (1870-1958)
1870-1958
Afrique occidentale française (1870-1958); Congo (1882-1958)
1870-1946
Provence-Alpes-Côte d'Azur, Rhône-Alpes (1870-1946); Côte française des Somalis (1883-1941); Afrique occidentale française, Tchad, Tunisie (1911-1943)
1870-1912
Shanghai, Tianjin (1870-1946); Chilung (1884-1885); Union Indochinoise (1887-1912); Hankou (1898-1946)
1870-1889
Guyane (1870-1889)
1870-1881
Algerie (1870-1881)
1870-1873
Aquitaine, Languedoc-Roussillon, Midi-Pyrénées (1870-1873)
1870-1871
Lorraine (1870-1871)
1870-1871
Alsace, Lorraine (1870-1871)
1870-1871
Alsace, Lorraine (1870-1871)
1871-1918
Franche-Comte, Lorraine (1871-1918); Afrique occidentale française, Congo, Oubangui-Chari, Tchad (1884-1918)
1873-1874
Aquitaine, Languedoc-Roussillon, Midi-Pyrénées (1873-1874)
1874-1931; 1975-
Aquitaine, Languedoc-Roussillon, Midi-Pyrénées (1874-1931; 1975-); Algérie (1870-1931); Afrique occidentale française (1884-1931); Congo (1882-1931); Maroc (1912-1931)
1881-1911
Tunisie (1881-1911); Tchad (1900-1911)
1882-1908
Congo (1882-1908); Oubangui-Chari (1903-1908)
1883-1936
Côte française des Somalis (1883-1936)
1887-1932
Union Indochinoise (1887-1932)
1889-
Guyane (1889-)
1900-1960
Tchad (1900-1960); Oubangui-Chari (1903-1960)
Years Bordering
Country
Borders With
1912-1949
Union Indochinoise (1912-1949)
1918-1933
Alsace, Lorraine (1918-1933)
1920-1923
Syrie (1920-1923)
1923-1946
Syrie (1923-1946)
1931-1939
Afrique occidentale française, Algérie, Aquitaine, Congo, Languedoc-Roussillon, Maroc, Midi-Pyrénées (1931-1939)