The top UN top court ruled on Tuesday largely in favor of Somalia in its dispute with Kenya, setting a sea boundary in part of the Indian Ocean believed to be rich in oil and gas.
Somalia said the ruling was a result of "sacrifice and struggle" by the Horn of Africa country.
A new boundary drawn by the International Court of Justice was closest to a line proposed by Somalia, attributing to it several offshore oil blocks claimed by Kenya.
The revised maritime border along the exclusive economic zones for the continental shelves of Somalia and Kenya "achieves and equitable solution", Judge Joan Donoghue said.
Kenya, which did secure some territory beyond the Somali claim, had failed to prove there was an established sea boundary between the states, which would have given it a greater portion of the disputed territory, the court found.
"We won the case of our sea which had been captured. This victory has not come through little effort..., it came through sacrifice and struggle," Somali Information Minister Osman Abokor Dubbe said on his Facebook page.
The ruling came after Nairobi last week said it had revoked recognition of the court's jurisdiction. No one for Kenya was officially present either in court or via video link.
The court has said Kenya's withdrawal is not retroactive and does not affect Tuesday's judgement.
Somalia filed the case in 2014 at the United Nations' highest court dealing with disputes between states.
The case at the ICJ, also known as the World Court, concerned a boundary dispute over more than 100,000 sq km (nearly 40,000 sq miles) of sea floor claimed by both countries.
