The picturesque Bureya Mountains above the Amur, the forest-clad Sikhota-alin on the Pacific, and the volcanic chains of Kamchatka belong, however, to quite another orographical construction, being the border-ridges of the terraces by which the great plateau formation descends to the depths of the Pacific Ocean.
It is owing to these leading orographical features - divined by Carl Ritter, but only recently ascertained and established as fact by geographical research - that so many of the great Rivers.
With broad plateaus which join those of central Russia, but their orographical relations to other upheavals must be more closely studied before they can be definitely pronounced on.
Owing to the orographical structure of the East-European plains, the river systems have become more than usually prominent and.
The orographical characteristics of the Caucasus are described in detail under that heading.