Where's Osama? Try Chitral, once a trekkers' paradise in Pakistan that has been sealed off to outsiders and is now regularly buzzed by American spy drones.

The U.S. won't say it officially, but an exhaustive Daily News investigation finds the world's biggest manhunt for the monster who murdered nearly 3,000 people on 9/11 has zeroed in on Chitral's stunning peaks and deep valleys.

Six U.S. and foreign officials confirmed to The News that northwestern Pakistan's impenetrable Hindu Kush mountains - which boast some of the world's tallest climbs - in the Chitral region have been eyed as Bin Laden's hideout since 2006 by Osama hunters aiming for the big kill.

A lengthy review of evidence, including recent Predator fly-bys, Bin Laden's tapes since 9/11 and interviews with three dozen experts on Al Qaeda, Pakistan and special operations, point to these vast mountains as the terror chief's most likely haven.

Captured Al Qaeda leaders have given up as his hideout. "Debriefings of Al Qaeda leaders arrested confirmed this," said Rohan Gunaratna, author of "Inside Al Qaeda."

Two senior foreign officials said the nearby town of Kalam also is suspect.

Drones were first spotted spying on Chitral last summer and were seen again as recently as Feb. 2. Chitral is so far from U.S.-run airfields that drone sorties are  limited to just a few hours because of fueling issues.

Moreover, Islamic militancy is taking root in several Chitrali valleys leading to the Afghan border, prompting Pakistan's tourism ministry to decree them off-limits to foreigners, local sources said - reinforcing the suspicion Osama is nearby.

CIA Director Leon Panetta has told Congress he asks "every day" where Bin Laden is hiding.

Reports of his location were rare after he escaped a U.S. onslaught in Afghanistan in 2001.

Saturday, Bin Laden's 29th tape since 9/11 was broadcast on Al Jazeera. He branded Israel's ongoing Gaza offensive a "holocaust," accused moderate Arab leaders of plotting with the West against Muslims, and urged his followers to prepare for holy war.

"There should be serious work and preparation for jihad to fulfill righteousness and defeat evil," he said.
It was too soon to date when the latest tape was made.

The CIA believes a Jan. 14 Bin Laden rant about Gaza was recorded in December - before Israel's incursion and before Chitral was cut off from the rest of Pakistan by heavy snows.

The News has found that only four of his tapes were ever recorded in the harsh winter months from January to March. Most were made in the fall, and no tapes were recorded in winter after 2003 until a year ago.