D'Entrecasteaux Channel (43°36'S., 147°09'E.) is a smooth water passage between the SE coast of Tasmania and Bruny Island, leading from the SW to the Derwent River. The S entrance of this channel extends from South East Cape, 20 miles ENE to Tasman Head, the S point of Bruny Island, with depths of 64m to 82m for the greater part of the distance across. The channel, about 35 miles long, is slightly winding, with the general direction being NNE. The width is irregular, varying from 5 miles within the S entrance to a little more than 0.5 mile in the N entrance. There is a least depth of 9.1m in the channel and 11m in the fairway.

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