The Ross Sea only comprise 2% of the Southern Ocean but is home to 38% of the world's Adelie penguins, 30% of the world's Antarctic petrels and around 6% of the world's population of Antarctic minke whales.
The isolated but wildlife-rich Ross Sea in the Southern Ocean is already thought to be one of the least-altered marine environments on the planet. "We urge the worldwide community to take notice and designate additional, permanent protections in other areas of the Antarctic Ocean and around the world".
The plan was opposed by China, Russia and Ukraine, who voiced concerns about their fishing industries.
The deal, put together by New Zealand and the U.S., became a reality after Russian Federation - the last country holding out on the creation of the protected area - agreed to the move.
Agreement was reached by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) - which is made up of 24 countries including the United Kingdom - and the European Union, to protect 600,000 square miles of the Ross Sea.
Earlier this year, President Barack Obama created the largest protected space on Earth.
The Ross Sea is named after British explorer Sir James Ross and his great, great, great granddaughter Phillipa Ross said the family was thrilled it was safeguarded.
U.S. Secretary of State John Kerry said the agreement is "further proof that the world is finally beginning to understand the urgency of the threats facing our planet".
"Although there was not a decision on the proposed protection of the Weddell Sea and the East Antarctic this year, we are confident that these areas will be protected in the coming years, adding to the system of marine protected areas in the Southern Ocean". However, some 28 percent of the area will be designated for research purposes - here, scientists are allowed to catch fish and krill, penguins, seals, and other animals.
"I want the Rough Sea to be the first in a series of marine protected areas around Antarctica". The European Union and 24 countries, including the USA, agreed to the deal.
"We urge the worldwide community to take notice and designate additional, permanent protections in other areas of the Antarctic Ocean and around the world".
The agreement was rigorously discussed for nearly two weeks, and after a five-year attempt of having the Ross Sea declared as protected, this year has officially made their dreams come true.
"We urge the global community to take notice and designate additional, permanent protections in other areas of the Antarctic Ocean and around the world".
Significantly, the protections are set to expire in 35 years.