Critics protested the flooding of a long scenic stretch of the Stanislaus River, which flowed over whitewater rapids through the deepest limestone canyon in the western United States.

As the river slices through a narrow, pine-tree studded limestone canyon filled with mountain goats, bald eagles and other wildlife, scenes come into view that are not visible from any roadway.

It is theatrical, and yet it seems very much at home in the limestone canyon of Wall Street.

At the 144-acre Columbus Park, dogtooth violets, white trillium and jack-in-the-pulpits carpet the ground beneath a randomly planted forest, and a cascading river tumbles through a stratified limestone canyon.

What: Lost Maples State Natural Area, a limestone canyon filled with bigtooth maples, black walnut trees, elms and sycamores (www.tpwd.state.tx.us).

This limestone canyon, also called the 'Grand Canyon of Verdon', 20 kilometres in length and more than 300 metres deep, is a popular climbing and sight-seeing area.

Walking that street was like walking the bottom of a dismal limestone canyon.

It is located in a narrow limestone canyon on the northern bank of the river Mtkvari (Kura), some 30 km from Tbilisi, Georgia's capital.

The Neandertal was originally a limestone canyon widely known for its rugged scenery, waterfalls and caves.

It protects the limestone canyon of Oregon Jack Creek, at the head of which is a waterfall named the Notch, above which is included a wetland area.