The moist soil encourages luxuriant thickets of willows (Salicineae), surrounded by dense chevaux-de-frise of wormwood and thornbearing Compositae, and interspersed with rich but not extensive prairies, harbouring a great variety of herbaceous plants; while in the deltas of the Black Sea rivers impenetrable beds of reeds (Arundo phragmites) shelter a forest fauna.
At the two extremities of New Caledonia, parallel longitudinal ranges of mountains enclose valleys; for the rest the island consists essentially of confused masses and ranges of mountains, rising to an extreme elevation of 5387 ft., the plains being chiefly the deltas of rivers.
The District of Ctttack lies in the centre of Orissa, occupying the deltas of the Mahanadi and Brahmani, together with a hilly tract inland.
Coast of the Black Sea between the deltas of the Kizil and Yeshil Irmaks.
The ordinary triangular form of deltas, due to the smoothing of the delta front by sea action, is here wanting, because of the weakness of sea action in comparison with the strength of the current in each of the four distributaries or passes into which the river divides near its mouth.