He conducted the negotiations which led to the shelving of the treaty of Unkiar Skelessi and to the alliance between Russia and Great Britain which, issuing ultimately in the Straits Convention of 1841 - to which France also was a party - healed the breach which had so long divided the powers of eastern and western Europe.
From its Coca branch to the mouth of the Curaray the Napo is full of snags and shelving sandbanks, and throws out numerous canos among jungle-tangled islands, which in the wet season are flooded, giving the river an immense width.
With flat and shelving shores, the shoal-banks off the main mouths of the delta form the chief danger to shipping, and this is guarded against by a good service of lighthouses and lightships.
Who does not remember the interest with which, when young, he looked at shelving rocks, or any approach to a cave?
Oysters abound on the eastern coast, and on the shelving banks of a vast extent of the northern coast the pearl oyster is the source of a considerable industry.