give reason There is little irrigation in the Himalayan Region in spite of large number of big rivers.
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Unlike deep-sea trenches, which are found in areas where one tectonic plate slides beneath another, undersea canyons are found along the slopes of most continental margins. They also occur along the slopes of the Hawaiian Islands and possibly certain other ocean islands. The majority of these V-shaped depressions have steep, rocky walls thousands of metres high. Those of the Grand Bahama Canyon, which are thought to be the highest, rise nearly 5 km (3 miles) from the canyon floor. The walls of the Grand Canyon of the Colorado River, by comparison, measure about 1.6 km (1 mile) high. Most submarine canyons extend only about 48 km (30 miles) or less in length, but a few are more than 320 km (200 miles) long. They usually are many kilometres in width; for instance, the Grand Bahama Canyon measures 37 km (23 miles) at its widest point.
A relatively large number of submarine canyons are located directly offshore of river canyons of adjacent land areas and may have once been connected to extensions of the latter. In most cases, however, the characteristics of the submarine variety and those of the nearby land canyons are quite distinct. The submarine canyons, for example, tend to have steeper side slopes, much higher gradients, and considerably narrower floors. Moreover, the drainage pattern of submarine canyons differs from that of their terrestrial counterparts. The submarine canyons have a substantial number of tributaries at their heads but generally do not have as many tributaries in their lower courses as do the land canyons. Even so, many submarine canyons end in a series of distributary channels through the continental rise, and these channels often emerge in the deep sea on abyssal plains that are found adjacent to the continents, especially in the Atlantic basin.
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