But the Abu Sayyaf's resilience is due in large measure to its roots in the warrior culture of an impenetrable region where, for centuries, no government has managed to hold sway.
Two years on, the Army has virtually emptied the country's once impenetrable northwestern tribal regions of TTP militants, and with support from American drone strikes, leveled much of its territory too.
Later, particular emphasis is given to the mid-frequency range 5 ⪅ ka ⪅ 25, which coincides with the "resonance region" of impenetrable scatterers.
The Impenetrable Chaqueño, a forest region in the north of Argentina, was the setting for this EYE SEE photography workshop, the first conducted especially for indigenous children.
We consider the motion of both point vortices and uniform vortex patches in arbitrary, possibly multiply connected, regions bounded by impenetrable walls on the surface of a sphere.
The 320 or so gorillas in the Virungas make up a little over half the world's population; the rest inhabit a separate region, the Bwindi Impenetrable Forest National Park in Uganda.
Their chief hideouts were Hole in the Wall, a nearly inaccessible grassy canyon and rocky retreat in north-central Wyoming; Brown's Hole (now Brown's Park), a hidden valley of the Green River, near the intersection of the borders of Wyoming, Colorado, and Utah; Robbers' Roost, a region of nearly impenetrable rugged canyons in east-central Utah; and the Wilson W.S. Ranch, near Alma, New Mexico.
There is a free-energy barrier located in the middle region between two impenetrable surfaces, and a free-energy well near the grafting surface in the free-energy landscape of a large NP within semiflexible polymer brushes.
Chris now occupies the wildest region, the Western Congolian swamp forests, an area characterised by impenetrable marshes and forest flooded for several months of the year.
The local dialect can be impenetrable, a mishmash of dialects from three neighboring regions, as well as Greek and Albanian.
