Selkiö Naval Treaty

1923 Treaty on the Limitation of Naval Arms

Nine-Power Treaty
Signing of the treaty
Type	Arms control
Context	WSS
Signed	March 12, 1923 (1923-03-12)
Location	Selkiö, Rajamaa
Effective	September 27, 1923 (1923-09-27)
Expiration	1936 (1936)
Negotiators	Ceadda Cenric Chun Kyung Soo NEGOTIATOR NAME Genki Hamatsura NEGOTIATOR NAME Juho Himanen NEGOTIATOR NAME NEGOTIATOR NAME NEGOTIATOR NAME
Signatories	Æþelric XI Lee Hyun Chung Napoléon IV Tadamichi Ideyoshi SIGNATORY NAME Jannu Ahtisaari SIGNATORY NAME SIGNATORY NAME SIGNATORY NAME
Parties	Federated Fire Territories Menghe Sieuxerr Dayashina Tír Glas Rajamaan Yhdysvallat New Tyran Akeniran Serenoro

The 1923 Treaty on the Limitation of Naval Arms, also known as the Nine-Power Treaty, was a treaty signed by all major parties involved in the War of Serenoran Succession, as well as a few neutral states, which agreed to prevent an arms race by limiting naval construction. It was negotiated at the Selkiö Naval Conference, held in Selkiö, Rajamaa, from December 15, 1922 (1922-12-15) to March 12, 1923 (1923-03-12). The treaty was signed by the governments of Fȳrēþel, Menghe, Sieuxerr, Dayashina, Tír Glas, Rajamaa, New Tyran, Akeniran, and Serenoro. It predominantly limited the construction of battleships, battlecruisers, and aircraft carriers by the signatories. Other categories of warships, including cruisers, destroyers, and submarines, were not limited in quantity by the treaty, although a qualitative limit of 12,000 tons displacement was in place for the latter vessel types.

The treaty was concluded on March 12, 1923 (1923-03-12), with ratifications being exchanged in Selkiö on September 27, 1923 (1923-09-27).

Later conferences sought additional limitations of warship building, specifically for cruisers. The push for limiting cruiser proliferation was primarily brought about by escalating tensions at the end of the 1920s, and the terms for the Nine-Power Treaty were modified by the Avallone Amendment of 1930 (1930).