Kittatinny Mountains - Kittatinny and Flatbrook Valleys

Kittatinny and Flatbrook Valleys

To the east of the Kittatinny Mountain, is the Great Kittatinny Valley. This is drained by the Paulinskill river in the south and the Wallkill River in the north. The Big Flatbrook drains the mountain on the northwestern end beginning at Steam mill swamp and flows in a southwesterly direction which drains into the Delaware River near Flatbrookville. This area is known as the Flatbrook Valley. The Port Jervis trough is at the northwestern end of the mountain.

The Delaware River flows near the mountain at the south end, finally cutting across the ridge at the Delaware Water Gap just south of Mount Tammany.

The Kittatinnies are a far northeastern extension of the Ridge and Valley province of the Appalachian Mountains. In Pennsylvania, the ridge forming the Kittatinnies becomes known as Blue Mountain and runs southwest for 150 miles (240 km), nearly to Maryland. In Franklin County, Pennsylvania, however, a parallel ridge to Blue Mountain is named "Kittatinny Mountain"; the Pennsylvania Turnpike tunnels through both ridges (a very short distance apart) with the western tunnel named "Kittatinny Mountain" and the eastern one "Blue Mountain." To the north in New York, the ridge is known as the Shawangunk Mountains which goes to Kingston, New York.