Between Port Dickson and White Island, there runs therefore a strong fresh-water current, at first in a northerly direction. The influence which the rotation of the earth exercises, in these high latitudes, on streams which run approximately in the direction of the meridian, is, however, very considerable, and gives to those coming from the south an easterly bend. In consequence of this, the river water of the Ohi and Yenisej must be confined as in a proper river channel, at first along the coast of the Tajmur country, until the current is allowed beyond Cape Chelyuskin to flow unhindered towards the north-east or east. Near the mouths of the large rivers I have, during calm weather in this current, in about 74° N.L., observed the temperature rising off the Yenisej to +9.4° C. (17th August, 1875), and off the Obi to +8° C. (10th August of the same year). As is usually the case, this current coming from the south produces both a cold undercurrent, which in stormy weather readily mixes with the surface water and cools it, and on the surface a northerly cold ice-bestrewn counter-current, which, in consequence of the earth's rotation, takes a bend to the west, and which evidently runs from the opening between Cape Chelyuskin and the northern extremity of Novaya Zemlya, towards the east side of this island, and perhaps may be the cause why the large masses of drift ice are pressed during summer against the east coast of Novaya Zemlya. According to my own experience and the uniform testimony of the walrus-hunters, _this ice melts away almost completely during autumn_.
In order to judge of the distance at which the current coming from the Obi and the Yenisej can drive away the drift ice, we ought to remember that even a very weak current exerts an influence on the position of the ice, and that, for instance, the current from the Plata River, whose volume of water, however, is not perhaps so great as that of the Obi and Yenisej, is still clearly perceptible at a distance of 1,500 kilometres from the river mouth, that is to say, about three times as far as from Port Dickson to Cape Chelyuskin. The only bay which can be compared to the Kara Sea in respect of the area, which is intersected by the rivers running into it, is the Gulf of Mexico.[9] The river currents from this bay appear to contribute greatly to the Gulf Stream.