Identify the topic sentence: Where is the topic sentence? 5. I knew a man once who told me that the thing he had most enjoyed in his life was drifting down a full river in an unknown land, gently touching the waters with the paddle of his canoe, sleeping in the wholesome bank at evening, and carrying on from open day to open day. He was fortunate enough to have found unknown land, and a full river, and conditions without peril and solitude all combined. Now, good autobiographies are of this kind.