BAGHDAD — Baghdad hasn’t been this quiet in years. But the respite from bloodshed comes at a high price.

Up to 20 feet high in some sections.

Rows after rows of barrier walls divide the city into smaller and smaller areas that protect people from bombings, sniper fire and kidnappings. They also lead to gridlock, rising prices for food and homes, and complaints about living in what feels like a prison.

Baghdad’s walls are everywhere, turning a riverside capital of leafy neighborhoods and palm-lined boulevards where Shiites and Sunnis once mingled into a city of shadows separating the two Muslim sects.

The walls block access to schools, mosques, churches, hotels, homes, markets and even entire neighborhoods — almost anything that could be attacked. For many Iraqis, they have become the iconic symbol of the war.

“Maybe one day they will remove it,” said Kareem Mustapha, a 26-year-old Sadr City resident who lives a five-minute walk from a wall built this spring in the large Shiite district.

“I don’t know when, but it is not soon.”

Indeed, new walls are still going up, the latest one around the northwestern Shiite neighborhood of Hurriyah, where thousands of Sunnis were slaughtered or expelled in 2006. They could well be around for years to come, enforcing Iraq’s fragile peace and enshrining the capital’s sectarian divisions.

Some walls are colorful, painted by young local artists with scenes depicting green pastures or the pomp and glory of Iraq’s ancient civilizations.

Others are religious or political, with posters of popular clerics or graffiti hostile to the United States, Israel or — most recently — Iraq’s prime minister.

Most are just bleak and gray, a reminder that danger lurks on the other side.

Dora, a one-time stronghold of Sunni insurgents in southern Baghdad, has so many walls and observation towers that some parts resemble a maze.

The district’s notorious Moali-meen area, which until a year ago had been among the most dangerous places in the capital, is now accessible to pedestrians through revolving iron doors guarded by security troops.

“The walls have stopped gunmen from coming into the neighborhood,” said Salim Ahmed, a 29-year-old oil refinery worker who lives and works in Dora. “But we also feel that we are in a prison and isolated from the rest of the city.”

In some areas of Baghdad, the walls delay the movement of food and other essential supplies, raising prices. Where successful in preventing attacks and reducing crime, the walls push up the prices of homes.

The U.S. military defends the walls, crediting them with disrupting the movement and supply routes of the Sunni militants of al-Qaida in Iraq and the Shiite militiamen of the so-called special groups.

First introduced by the Americans in 2003 to protect their Green Zone headquarters, walls became much more widespread with the launch early last year of a major security campaign in Baghdad. In some walled-off neighborhoods, access was granted only on proof of residence or special ID cards.

Nowadays there’s hardly a street in Baghdad without a wall.