Rio De Janeiro, Brazil ? A swath of Amazon rain forest the size of Alabama was placed under government protection Monday in a region infamous for violent conflicts among loggers, ranchers and environmentalists.

The protected territory totals 57,915 square miles of the Guayana Shield region, an area of Amazon forest stretching across international borders that contains more than 25 percent of the world’s remaining humid tropical forests and the largest remaining unpolluted freshwater reserves in the American tropics.

The protected areas will link to existing reserves to form a vast preservation corridor eventually stretching into neighboring Guyana, Suriname and French Guiana. While the entire Guayana Shield corridor is not yet protected, portions of it in each country are now covered.

The Washington-based environmental group Conservation International put up $1 million to facilitate the expansion, which preserves much of the jungle’s largely untouched north. Still, it’s far from clear how much the new reserves will do to stall Amazon destruction, because most of the deforestation is taking place along the rain forest’s southern border.

“If any tropical rain forest on Earth remains intact a century from now, it will be this portion of northern Amazonia,” Conservation International President Russell Mittermeier said. “The region has more undisturbed rain forest than anywhere else.”

The Amazon region covers 60 percent of Brazil, and 20 percent of its forest – 1.6 million square miles – already has been destroyed by development, logging and farming. During the last four years, an area larger than South Carolina has been cut down.

The protections, announced Monday by the Para state government, are all the more surprising coming out of a state twice the size of France long known for ruthlessly cutting down the rain forest and where ranchers often gun down those who try to stop it. The 2005 murder of American nun Dorothy Stang is only the most notorious killing of forest defenders in the largely lawless jungle frontier.

Stang, 73, of Dayton, Ohio was shot dead in a dispute over a piece of land she wanted to preserve and local ranchers wanted cut down to raise cattle.

The new protected areas will help break the power of ranchers who often claim ownership of areas the size of small European nations and rule them as their own personal fiefdoms, said Para state environment secretary Raul Porto. These ranches are so huge in part so that landowners can appear to limit clear-cutting to 20 percent of their Amazon property, as required by law.

The law is routinely ignored but still has contributed to vast land-grabs, Porto said. Now, with the state managing timber concessions in most of these forests, “sustainable” logging will be encouraged.

“Now there’s no need for the plantation-type estate, which was our biggest problem,” Porto said in a televised interview.

Two of the new protected areas, covering 22,239 square miles, would place the land completely off-limits to the general public and only be accessible to researchers.

Together, these two areas are believed to contain up to 54.1 percent of all bird, animal and plant species found in the Amazon, Conservation International said. They also are home to several endangered animal species.